Opening your windows doesn’t help reduce indoor air pollution

Airing out our homes might not be as effective as we think. Chemicals released by cleaning or cooking can stick to walls, furnishings and other surfaces instead of wafting out when we open a window.

“It’s quite a surprise,” says Chen Wang at the University of Toronto, Canada. “We thought that when we diluted the volume of the air in the house [these] may just get removed and mix with the outside air.”

She and her colleagues studied the persistence of 18 common indoor chemicals inside a mock house. Some of these, such as carboxylic acids, appear to be released by cooking. We don’t know yet if they are harmful to human health when they accumulate in the home.

These chemicals are all volatile, meaning they can evaporate into air, but the researchers wanted to see if they can linger on surfaces too. The team asked volunteers to mimic real-life activities in the house, such as cooking and cleaning, and then measured the levels of these 18 chemicals in the air.

The researchers then ventilated the home by opening its windows and doors and then measured the airborne levels of the 18 chemicals again after they were closed. The team found that ventilation for 15 or even 30 minutes made little difference – the chemicals soon reached similar levels in the air as before.

Wang says the airborne levels of these chemicals in our homes aren’t high enough to be concerning, but that they are likely to be higher after cooking or cleaning.

“Modern houses are becoming more air-tight as we try to conserve energy,” says Frank Kelly at King’s College London. This may be bad for our air quality unless homes are built with mechanical ventilation systems, he says.

Journal reference: Science Advances, DOI: 10.1126/sciadv.aay8973

via Opening your windows doesn’t help reduce indoor air pollution | New Scientist

Posted in Air Quality, World News | Tagged , , | Leave a comment

Iran Air Pollution Claims 30,000 Lives Every Year

Growing population and consumerism has taken a harsh toll on the environment, the DOE chief says, stressing that none of Iran’s industries is eco-friendly

Toxic air pollution in Iranian metropolises is twice as lethal as road crashes, as it annually claims over 30,000 lives, director of the Department of Environment said.

Speaking during a meeting in Tehran on Sunday, Isa Kalantari said, “Annually, over 16,000 people lose their lives in fatal road crashes, while air pollution claims over 30,000 innocent lives. Addressing the alarmingly high rate should be high on state agencies’ agenda.”

The DOE chief noted that rising population and consumerism has taken a harsh toll on the environment, ISNA reported.

“None of our industries and activities is eco-friendly. The government had numerous promising plans for restoring the environment, some of which progressed to some extent. Unfortunately, they were mostly left incomplete due to limitations faced by the country, because of US sanctions,” he added.

via Iran Air Pollution Claims 30,000 Lives Every Year | Financial Tribune

Posted in Air Quality, Iran, Middle East | Tagged , , | Leave a comment

Exposure to ambient ultrafine particles may trigger nonfatal heart attack

Yale-affiliated scientist finds that even a few hours’ exposure to ambient ultrafine particles common in air pollution may potentially trigger a nonfatal heart attack.

Myocardial infarction is a major form of cardiovascular disease worldwide. Ultrafine particles (UFP) are 100 nanometers or smaller in size. In urban areas, automobile emissions are the primary source of UFP.

The study in the journal Environmental Health Perspectives is believed to be the first epidemiological investigation of the effects of UFP exposure and heart attacks using the number of particles and the particle length and surface area concentrations at hourly intervals of exposure.

UFP constitute a health risk due to their small size, large surface areas per unit of mass, and their ability to penetrate the cells and get into the blood system. “We were the first to demonstrate the effects of UFP on the health of asthmatics in an epidemiological study in the 1990s,” said Annette Peters, director of the Institute of Epidemiology at Helmholtz Center Munich and a co-author of this paper. “Since then approximately 200 additional studies have been published. However, epidemiological evidence remains inconsistent and insufficient to infer a causal relationship.”

With colleagues from Helmholtz Center Munich, Augsburg University Hospital and Nördlingen Hospital, Chen examined data from a registry of all nonfatal MI cases in Augsburg, Germany. The study looked at more than 5, 898 nonfatal heart attack patients between 2005 and 2015. The individual heart attacks were compared against air pollution UFP data on the hour of the heart attack and adjusted for a range of additional factors, such as the day of the week, long-term time trend and socioeconomic status.

“This represents an important step toward understanding the appropriate indicator of ultrafine particles exposure in determining the short-term health effects, as the effects of particle length and surface concentrations were stronger than the ones of particle number concentration and remained similar after adjustment for other air pollutants,” said Chen. “Our future analyses will examine the combined hourly exposures to both air pollution and extreme temperature. We will also identify vulnerable subpopulations regarding pre-existing diseases and medication intake.”

Source:
Yale School of Public Health

via Exposure to ambient ultrafine particles may trigger nonfatal heart attack

Posted in Air Quality, Health Effects of Air Pollution, Medical Studies | Tagged , , , | Leave a comment

The casualties of Mongolia’s doomed love affair with coal

All the rooms in the three-storey Songinokhairkhan hospital in western Ulaanbaatar, Mongolia’s capital city, are full. They are mostly occupied by small children being treated for respiratory problems, according to the busy nurses here.

The cause is heavy pollution, mainly from the country’s decades-long over-reliance on coal.

Children’s hospitals in the area are overburdened and paediatricians can only treat the symptoms of health problems caused by air pollution, they are unable to remove the cause.

A young mother, Ganchimeg, waits for the fever to let up in her one-year-old daughter’s trembling body. They have been here all day. “She’s been coughing a lot,” says the tired mother. “When we came here they told me it’s probably pneumonia.” Her daughter smiles, and then coughs.

UNICEF declared Mongolia’s air pollution problem a “child health crisis” in a 2018 report which stated: “In the last 10 years, incidences of respiratory diseases in Ulaanbaatar alarmingly increased including a 2.7-fold increase in respiratory infections per 10,000 population.

“Pneumonia is now the second leading cause for under-five child mortality in the country. Children living in a highly polluted district of central Ulaanbaatar were found to have 40 percent lower lung function than children living in a rural area.”

Ariunsanaa and Oyun (Mongolians tend only to use one name), are a young couple living in Ulaanbaatar’s western ger district. Gers are traditional Mongolian yurts – small wooden structures in which whole families live.

Both their children – a four-year-old son and a one-year-old daughter – have been hospitalised this winter with fever, coughing and, eventually, pneumonia. “Same old story every winter,” says Ariunsanaa, preparing suutei tsai and biscuits inside their ger while the TV shows flickering images of a conflict far away.

“It’s the same strain of the flu that returns every winter, and every year it takes its toll on the kids a lot worse than the previous winter.

“Medicines and antibiotics aren’t free, you know,” he adds.

Behind a curtain hangs Ariunsanaa’s shaman coat. Interest in Mongolian Shamanism has risen among the young, after being banned during Communist rule. Local people seek Ariunsanaa’s counsel on matters from relationships to health.

The price of success

This is not all that has changed here since the fall of Communism.

Democracy’s arrival in Mongolia in 1990, alongside an economic boom from the country’s rich coal resources, gave birth to a market-economy class system defined by stunning income inequality.

“Despite strong overall growth, job creation and poverty alleviation remains a significant challenge,” is how the International Monetary Fund summarised the situation in its 2019 member-country report.

So, while doctors recommend that people – especially those with small children – leave Ulaanbaatar for fresh air, this is a luxury that few can afford.

“I don’t want to be pregnant again, I’m too afraid,” says Oyun. “When pregnant, both times during winters, I was constantly afraid that air pollution would lead to birth defects.”

In the mid-2010s, Mongolia, riding the wave of its mining boom, was hailed as “the world’s fastest-growing economy” by the World Bank. But the global financial crisis and subsequent boom and bust in commodity prices dealt a severe blow to Mongolia, fuelling poverty, unemployment and despair.

A $5.5bn bailout from the International Monetary Fund helped pull Mongolia’s economy off its knees.

In 2018 the country produced 34.4 million tonnes of oil equivalent (TOE) of coal – a record. Overall, the National Statistical Office (NSO) of Mongolia says, the mining industry represents nearly 22 percent of the nation’s revenue for 2019.

Despite this, coal is not the magic bullet for Mongolia that many believed it to be; it is also a poisoned chalice. It is proving to be a “resource curse”, whereby a country’s over-reliance on one or a limited number of natural resources – in Mongolia’s case, coal and copper – can lead to a failure to invest in other sectors as well as a higher risk of corruption.

In its 2019 report, Freedom House, the US government-funded NGO, highlights increasing corruption levels within the mining sector in Mongolia, despite – or perhaps because of – “vaguely written and infrequently enforced” anticorruption laws.

But most of all, coal is dirty and its over-use has triggered a health and environmental crisis in Ulaanbaatar as well as further afield.

‘There were a lot of people sick’

On the Mongolian steppe, seemingly far removed from the centre stage of the coal industry, the effects of this over-reliance on coal are already hitting the country’s nomadic population hard.

The Batbold family’s ger, camouflaged by snow, sits surrounded by valleys outside Karakorum, the ancient Mongol capital founded by Genghis Kahn.

There are other gers within walking distance, dotted between enclosures for the animals and giant piles of wood to heat these rudimentary homes. Other than that, these families live alone – as Mongolian nomads have done for centuries.

It is a way of life. But Mongolia’s nomads, reliant on livestock and mostly contributing to the cashmere industry, now stare the consequences of climate change right in the eye, embodied by a man-made catastrophe they call the “dzud”, a term for the severe winters marked by starvation, cold and financial hardship that they now endure every year.

Millions of livestock have died due to the dry summers followed by the extreme winters over the past decade in Mongolia, according to a 2018 report by the research journal, Nature.

It states: “Alleviating the impacts of climate change on herder communities, through strengthening adaptive capacities, risk reduction strategies, including reducing herder vulnerability to future hazards, and resilience in degraded environments, will be a crucial challenge.”

This extreme weather phenomenon is the scourge of every nomad’s daily life. “Here, winter starts in the summer,” says Chantsaldulam Batbold.

She is paying “tribute” to the sky, mountains and soil outside the family ger by throwing spoons of fresh cow’s milk into the air, in a kind of offering. “We thought the summer would be good; it wasn’t. There is no grass for the animals and the winter is getting harder.”

Every day, the family takes the livestock – 100 cows, goats, horses and sheep – out in search of suitable pastures. “We can’t get enough hay to them due to higher prices, and even if we had, it’s not nutritious enough,” says Banzragch Batbold as he saddles his horse. Chantsaldulam hands him a thermos with warm suutei tsai, a traditional Mongolian beverage consisting of milk, salt, tea leaves and water.

The nearby river is ice-covered and melted snow serves as drinking water. All seven Batbold children, who range in age from nine months to 10 years, see their father off and play outside until their mother hauls them back inside. Three of them, who attend boarding school in Ulaanbaatar, returned from school with the flu just before Christmas – another effect of the pollution, Chantsaldulam suspects.

“There were a lot of people sick at the school, as is usually the case this time of the year,” she says.

As inside any typical Mongolian ger, life is divided into sections: the kitchen area; beds; a couch for visitors; a shrine for valuables, family portraits, clothing and a TV set. The heart of the ger is the stove, which provides heat during the harsh winter season.

The temperature can reach 30°C inside the ger while outside it gets as cold as minus 20°C.

Climate change has been particularly extreme in Mongolia, where the average temperature has increased by 2.2°C since 1940 – compared to 0.85°C for the planet in general – causing havoc with weather patterns.

According to a 2019 report from the European Institute for Asian Studies, Mongolia’s mining sector is to blame for this and, therefore, for the resulting compromised biodiversity and worsening public health. The report states: “Mining activities and mining-related infrastructure projects have, indeed, contributed to the rapid increase of CO2 emissions in the country, the vast erosion of pasture land and deforestation.”

The choice for those living on the ground? Put up with it or get out.

“On the steppe, you’re on your own,” laments Chantsaldulam. Many have opted for the latter, heading to Ulaanbaatar’s ger districts, where thousands of former nomads-turned-city-dwellers reside in a socioeconomic parallel society.

In 2001, Ulaanbaatar’s total population was 630,000; in 2014 it had reached over one million. It is now 1.6 million. One in four inhabitants of Ulaanbaatar lives in what the International Monetary Fund describes as “shanty towns” – the ger districts – and 28.4 percent of the population are living below the poverty line, according to Mongolia’s National Statistical Office.

Chantsaldulam and Banzragch know both worlds but fancy neither; climate change has altered everything, everywhere.

“When you walk alongside your animals, day in and day out for many years, you realise what’s at stake,” says Banzragch. “The wheel of life is shifting on its axis.”

Extreme measures

Ulaanbaatar was called Urga (“Palace”) until 1924, when, as the capital of the new Mongolian People’s Republic, it adopted its Soviet-style name, which means “Red Hero”.

Mountain plateaus surround the city, which functioned as a Buddhist meeting point in the 1700s. Winds come from Siberia in the north, turning the winters into long, cold periods of existence under a veil of smog. At 1.6 million, the population of the city has trebled since 1989. Ulaanbaatar’s undeveloped outskirts have swelled like balloons and these ger districts lack sustainable access to electricity and clean water, making coal – now, government-issued briquettes – the only option for cooking and heating.

As a result, the authorities blame Ulaanbaatar’s ger districts for 80 percent of the recent years’ hazardous air pollution levels which are taking their toll on residents. Small children, the elderly and pregnant women are particular prey for infections, viruses and diseases, which spread easily in poorly ventilated facilities.

A preschool named “63” in Gachuurt, eastern Ulaanbaatar, has taken extreme measures to protect its children.

“We’ve installed air purifiers, updated ventilators and keep all windows closed at all times to guarantee our 150 pupils access to fresh air and clean food,” says principal Nyamsuren Enkhtsetseg.

The view through the window on the second floor, however, shows the preschool’s neighbour is a heating plant. Raw coal emissions from it sweep over a part of Ulaanbaatar where the ban on raw coal has yet to be implemented, forcing all children to wear protective masks whenever they play outside. “We’ve begged the authorities to remove it; but nothing’s happened,” sighs Enkhtsetseg.

In December 2018, the Mongolian government banned the use of unprocessed, raw coal for domestic cooking and heating, a directive which has been implemented in six of Ulaanbaatar’s nine düüregs (districts) so far. The ban will take effect in the remainder in 2021.

Government-issued coal briquettes, which are “cleaner” than raw coal but are still rationed, provide a substitute and have helped to nearly halve the city’s air pollution levels. The briquettes, made from coal powder and coking coal from the southern Gobi region, are produced at a newly built plant in Ulaanbaatar and sold at certified “briquette stations” throughout the capital.

Residents who need heating coal must show ration vouchers to buy them for $1 a bag – no voucher, no briquettes.

At one of the distribution sites, a woman without her briquette coupon is trying to purchase a bag, anyway. The briquette vendors shake their heads; there is nothing they can do. If they sell to unauthorised customers they risk a 30 percent salary deduction.

“How am I supposed to heat our home tonight?” the woman asks, then turns and leaves the station, her two children trying to keep up with her.

It is doubtful that rationing will be respected by everybody. People will always find a way around it – especially when the cold bites. “People are using briquettes just like the old raw coal and burning them the same way,” Byambajargal Losol, a physicist at the Mongolian Science Academy, told AFP in November last year. “The briquettes are thick and compact so they require twice as much oxygen to burn, compared to raw coal.”

But the raw coal ban signals political responsibility, proclaims Gabymbyme Haldai, head of Ulaanbaatar’s Air Pollution Reduction Department. “The briquette transition has halved our air pollution levels in just one winter. Now, the production capacity at the briquette plant must increase and the ban implemented in wider areas.”

Haldai sees no problems with Mongolia’s dependence on coal. “Coal makes Mongolia energy independent,” he states.

Questions about sustainable energy investments seem to annoy him. “I don’t know where you come from or what energy sources you use. Here, we experience extreme weather conditions,” Haldai says.

The ban on raw coal, however, “will only take Mongolia so far”, says Alex Heikens, UNICEF’s Mongolia representative. “Its visible positive results might end up counterproductive. Only 90 percent decreased air pollution will make any real difference to climate and people’s health.”

Eight residents of Ulaanbaatar have suffocated to death in their sleep due to carbon monoxide poisoning after burning briquettes, and 1,000 people have been hospitalised with symptoms of nausea and breathing difficulties since October last year.

‘Times have never been so hard’

Government attempts to curb pollution – most notably by banning the use of raw coal in some areas – have brought new hardships to those reliant on the mining industry for a living.

Darkness falls over the industrial remnants of Nalaikh’s now-closed and abandoned open-pit coal mine, 40km east of Mongolia’s capital, Ulaanbaatar. The once state-owned mine shut down because of the fall in demand for raw coal, but the coal reserves are still there. They are now hauled out of narrow, small-scale shafts run in semi-illegal fashion, providing middlemen with raw coal to sell on the black market.

A dirt road ends at a 120m-deep shaft here. Five miners drink Coca-Cola and smoke cigarettes inside a ger, which has been raised next to the shaft. “I’ve been a miner since I was a kid,” says Khurelshagai, smiling at clips of his daughters on his phone. “But times have never been as hard as today.”

From the 1950s, Nalaikh Coal was a major local job provider and an important provider of energy to Ulaanbaatar. But it was also the primary contributor of carbon dioxide emissions and high levels of hazardous, atmospheric particles called PM2.5These microscopic particles enter the lungs and the bloodstream, and are responsible for turning Mongolia’s capital into one of the world’s most polluted cities.

“There is really no affordable alternative [to coal] in terms of clean fuel,” said Delgermaa Vanya, health and environment officer at the World Health Organization in a 2019 report. “As a result, in the winter months over 600,000 tonnes of raw coal are burned for heating in the city’s approximately 200,000 gers, accounting for about 80 percent of Ulaanbaatar’s winter pollution.”

The ban on raw coal has helped Mongolia’s ecological and financial climate – but it has also rewritten life in Nalaikh, where locals talk of shattered businesses and a lost future. Industrial-scale coal production is a thing of the past there, although small quantities of raw coal are still hacked and scavenged from semi-illegal, squatted shafts and sold, either to Ulaanbaatar’s remaining raw-coal heating plants or on the black market.

Mongolian democracy is primarily embodied as the financial liberalisation of big industries, says Tserengund, one of the miners. He is having a smoke on the slope overlooking the 120m-deep narrow shaft. He has coughed, dug and stooped his way through narrow shafts for 20 years to provide for his wife and son. His only reward will be a broken body. “The boss can’t pay me; I just get daily coal rations for heating and cooking. But I have no other choice, we don’t want to freeze to death.”

Night temperatures fall close to minus 30°C. Nalaikh’s last coal miners catch their breath upon the slope; they have the air of guardians of a lost industrial kingdom. Tserengund looks around, seeing more than just the piles of gravel, debris and a silent industrial no-man’s land.

“This used to be a place of pride,” he laments. “Both my grandparents and parents worked here. In the summers, cows pastured in the surrounding hills. Back then, the place was green.”

“Now,” he sighs, “It looks like a war zone.”

via The casualties of Mongolia’s doomed love affair with coal | Environment | Al Jazeera

Posted in Air Quality, Asia, Mongolia | Tagged , , , , | Leave a comment

Air pollution may aggravate nasal suffering with colds and seasonal allergies

People who get rhinitis – an inflamed or congested nose – from colds or allergies may feel much worse if they’re exposed to high levels of air pollution, a recent study suggests.

Rhinitis usually involves some combination of congestion, sneezing, nasal irritation and sometimes a reduced sense of smell, and it affects up to half of the world’s population, the study team writes in Journal of Allergy & Clinical Immunology.

“Breathing polluted air will cause inflammation and oxidative stress on the respiratory tract,” said lead study author Emilie Burte of INSERM in Villejuif, France.

“That probably will increase the frequency or severity of rhinitis symptoms,” Burte said by email.

Even though rhinitis is especially common among people with asthma – a condition that’s aggravated by air pollution – research to date hasn’t offered a clear picture of how air quality impacts the severity of rhinitis.

For the current study, researchers examined data on air pollution exposure and symptom severity for about 1,400 people with rhinitis in 17 European cities.

Two types of pollutants in particular were associated with worse rhinitis symptoms: nitrogen oxide, a byproduct of fossil fuel combustion that contributes to smog; and so-called PM 2.5, a mixture of solid particles and liquid droplets smaller than 2.5 micrometers in diameter that can include dust, dirt, soot and smoke.

People in cities with the highest levels of PM 2.5, or fine particulate matter, reported the most severe rhinitis symptoms.

Each increase of 5 micrograms per cubic meter of air (mcg/m3) in concentrations of fine particulate matter was associated with a 17% higher chance that people with rhinitis would experience severe symptoms, the study found.

Fine particulate matter was associated with worse congestion, nasal irritation and sneezing.

Nitrogen dioxide was also tied to more severe rhinitis, particularly for symptoms like nasal discharge and congestion.

The pollutants exacerbating rhinitis in the study have long been linked to traffic fumes, with worse air quality around major roadways in cities around the world.

While the study wasn’t designed to prove whether air pollution causes rhinitis or makes symptoms worse, it’s possible that each kind of contaminant in the air does its own type of damage in the respiratory system, Burte said.

People prone to colds and allergies can’t do much to prevent pollution from making rhinitis worse, aside from staying indoors, said Yaguang Wei, an environmental health researcher at Harvard University in Boston who wasn’t involved in the study.

People can pay attention to air quality alerts for their city or community and plan to stay indoors or at least avoid vigorous activity outside during peak pollution times.

“For indoor air pollution, air purifiers can clean indoor air and protect your family, especially for children and the elderly,” Wei said by email.

People can also do their part to reduce traffic fumes.

“Using public transportation can help reduce air pollution emissions,” Wei said.

SOURCE: bit.ly/31W84az Journal of Allergy & Clinical Immunology, online January 23, 2020.

via Air pollution may aggravate nasal suffering with colds and seasonal allergies – Reuters

Posted in Air Quality, Health Effects of Air Pollution, Medical Studies | Tagged , , , , | Leave a comment

Deadly air pollution is blowing into your state from a surprisingly large source

Air pollution doesn’t respect borders. A power plant in one place often ends up killing people who live far downwind. Now, a detailed analysis of how air pollution moves in the United States reveals that since 2005 premature deaths caused by two of the biggest polluters—power plants and traffic—have fallen significantly. The bad news: Deaths from residential and business emissions, like those from heating and burning trash, grew nearly 40% over the same period.

Air pollution kills when particles from burning coal, wood, or natural gas react in the atmosphere to create ozone and soot. Those particles damage airways and the cardiovascular system. In the United States, such pollution causes many deaths each year; estimates range between 90,000 and 360,000.

But figuring out how all the various sources of pollution spread and threaten health is a herculean task. So Steven Barrett, an atmospheric scientist at the Massachusetts Institute of Technology; aerospace engineer Irene Dedoussi, now at Delft University of Technology; and colleagues used a computer model of winds and atmospheric chemistry. They added data from U.S. Environmental Protection Agency (EPA) air pollution surveys to study large sources of pollution, including power plants, industry, roadways, and homes and businesses. The model revealed how the pollution moves from state to state, reacting with other compounds to form harmful particles. Because people are exposed to pollution from multiple sources, the model estimated the contributions from all these sectors and their added risk of death.

There has been progress since 2005. Overall, about 30,000 fewer people died from air pollution in 2018, they report today in Nature. Deaths related to power plant emissions fell 65% to 8500, and deaths related to traffic pollution fell 50% to 18,600. Much of the former improvement, Barrett says, comes from tighter EPA regulations and economic factors that favor cleaner burning natural gas over coal.

“All those years of effort to control power plant pollution, and to some extent road transport, have dramatically reduced the contributions of those sources—and that’s good news,” says Dan Greenbaum, an air quality expert and president of the Health Effects Institute, a research organization that studies air pollution.

But the benefits depend on where you live: Forty-one percent of premature deaths from air pollution still result from out-of-state emissions, the study found. “That’s a startlingly high figure,” says John Walke, who directs the clean air, climate, and clean energy program at the Natural Resources Defense Council, an environmental advocacy organization. “This is the first time that I’ve seen such a precise estimation … attributed to upwind emissions.”

Power plants remain the dominant cause of these out-of-state deaths because those emissions travel longer distances. Greenbaum says the findings reinforce the need to tackle air pollution with a national approach, as EPA has done. Giving more power to the states to regulate air quality would jeopardize progress, he says.

Barrett says he was surprised by a different finding: the significant, and growing, impact caused by residential and commercial pollution. Such emissions caused 20,400 premature deaths in 2005, a number that rose to 28,200 by 2018. But the 38% increase isn’t due to large increases in air pollution. Instead, as less sulfur dioxide and nitrogen oxides enter the atmosphere from coal-burning power plants, the ammonia and nitrogen oxide byproducts of residential and commercial burning are more likely to form harmful particles.

Dan Goldberg, who researches air pollution at George Washington University, was also surprised by the increase. Because commercial and residential emissions are understudied compared with other sources, he’s not yet fully convinced by that trend. But given the shifting burden, the researchers calculate that a 10% reduction in air pollution from residential and commercial sources would yield more than three times the health benefits of a 10% reduction from power plants.

Still, most experts would be loath to have to choose which sector to clean up. “For me,” Barrett says, “the right answer for emissions is ultimately zero.”

via Deadly air pollution is blowing into your state from a surprisingly large source | Science | AAAS

Posted in Air Quality, USA, USA & Canada | Tagged , , , , , , | Leave a comment

More evidence links ozone pollution to premature death

People who live in cities where the air is polluted by factories and traffic fumes may not live as long as they would have with cleaner air, a recent study suggests.

Researchers focused on ozone, an unstable form of oxygen produced when various types of traffic and industrial pollution react with sunlight. Worldwide, about four in five people in urban areas are exposed to ozone levels that exceed safe levels recommended by the World Health Organization, the study team notes in The BMJ.

The study looked at ozone levels and deaths in 406 cities in 20 countries around the world. It found that overall, about 6,000 deaths a year in those cities could be prevented if stricter air quality standards reduced ozone levels below the WHO-recommended maximum of 100 micrograms per cubic meter of air (mcg/m3).

“Our study confirms the evidence from previous studies on the adverse health impacts associated to the exposure to ground-level ozone,” said lead study author Ana Maria Vicedo-Cabrera of the University of Bern in Switzerland.

“Patients should be aware of the risks of the exposure to high levels of ozone, in particular when their health is already compromised,” Videco-Cabrera said by email.

Air pollution has long been linked to higher risks of heart attacks, strokes, asthma attacks and other respiratory problems with the potential to shorten people’s lifespan. Less is known, however, about how much exposure to ozone levels higher than WHO limits might directly impact longevity, the study team notes.

In the current study, researchers examined data on ozone levels and more than 45 million deaths between 1985 and 2015.

On average, a 10 mcg/m3 increase in ozone during the current and previous day was associated with a 0.18% increased risk of death, the study team found.

Even when cities had ozone concentrations below WHO limits, levels between 70mcg/m3 and 100mcg/m3 were still associated with an increased risk of death during the study period. This suggests that even stricter air quality standards might be needed, the study team concludes.

The study wasn’t designed to determine whether or how ozone exposure might cause premature deaths.

The researchers also didn’t have enough data from certain regions of the world, including South America, Africa, and the Middle East, to craft a truly global estimate of how ozone exposure impacts longevity. The ozone assessment also didn’t look at outdoor versus indoor air quality.

“We don’t fully understand the entire pathway from ozone exposure to mortality,” said Dr. Frank Gilliland, a researcher at the University of Southern California in Los Angeles who wasn’t involved in the study.

“We do know that ozone is a toxic gas that produces airway and systemic oxidative damage and inflammation when inhaled these adverse effects are likely to have large impacts on those with health problems such as respiratory conditions or who are frail from aging,” Gilliland said by email.

SOURCE: bit.ly/2UKNecD The BMJ, online February 10, 2020.

via More evidence links ozone pollution to premature death – Reuters

Posted in Air Quality, Health Effects of Air Pollution, Medical Studies | Tagged , , , , | 1 Comment

Cairo car drivers exposed to dangerous levels of pollution, new study finds

Car drivers in Cairo are exposed to dangerous levels of air pollution, finds an unprecedented new study from the University of Surrey.

Greater Cairo, which is the sixth largest city in the world, is home to 2.4 million cars and it is thought that particulate matter (PM) concentration – i.e. air pollution – is the cause of around 10 per cent of premature deaths in Egypt.

In the study ‘Car users’ exposure to particulate matter and gaseous air pollutants in megacity Cairo’ published in Sustainable Cities and Society, a team led by Surrey’s Global Centre for Clean Air Research (GCARE), together with the American University in Cairo, investigated the contributing factors that determine particulate matter (PM) exposure levels while in a vehicle – for different car settings (open window, closed window, or with air conditioning (AC) on), during different times of the day and across various commuter routes (cross city and inner city).

The results found that Cairo motorists who drive with their windows open can be exposed to 65 per cent more PM10 (coarse particles) and 48 per cent more PM2.5 (fine particles) than those who drive with windows closed and the AC on. However, many car owners simply do not have AC in their vehicles and are exposed to levels of PM10 and PM2.5 as high as 227 and 119 μg/m3 while driving through cross-city routes.

The study further found that evening peak hours are more congested, causing drivers to get exposed to higher pollution concentrations compared to morning peak hours.

The team also discovered that Cairo’s close proximity to the desert and its low precipitation rates are contributing factors to higher concentration of PM10. GCARE found that areas with high construction activity or unmaintained roads also feature higher levels of PM10.

Professor Prashant Kumar, Founding Director of GCARE at the University of Surrey, said: “Air pollution causes seven million premature deaths worldwide, disproportionately affecting poor and vulnerable communities and exacerbating inequalities in official development assistance (ODA) countries. Knowledge is invaluable in our battle against climate change and air pollution, which is why we hope that our study -the first of its kind – is not the last.”

via Cairo car drivers exposed to dangerous levels of pollution, new study finds | EurekAlert! Science News

Posted in Africa, Air Quality | Tagged , , , , , | Leave a comment