A biomass fire near Tracy continues to produce significant smoke impacts, affecting the air quality in three counties.
The San Joaquin Valley Air Pollution Control District said the smoke from the fire is being sent to San Joaquin, Stanislaus and Merced counties.
Smoke from the blaze can emit fine particulate matter (PM2.5), which can cause health issues such as asthma attacks, lung disease and increase the risk of heart attacks, according to the air district. Potentially vulnerable are those with respiratory conditions and older adults and children.
Firefighters extinguished the large fire that burned for several days, leading air officials to issue the health advisory.
Air district officials urge residents in these counties to avoid any prolonged exposure or heavy exertion, depending on local conditions, and to follow any orders relating to fire emissions given by their doctors.