Figures showing a reduction in levels of air pollution over the last 25 years have been welcomed by the Environment Minister.
Official statistics reveal a long-term cut in emissions of all the main pollutants.
Between 1990 and 2013, Scotland saw decreases in emissions of 28% for ammonia, 53% for particulate matter and 67% for nitrogen oxides.
Emissions of carbon monoxide, sulphur dioxide and lead were down 81%, 87% and 99% respectively over the same period.
Last year, sulphur dioxide emissions from large combustion plants fell by 34% compared with the previous year, mainly due to the closure of Cockenzie power station in East Lothian in March 2013, the data reveals.
Environment Minister Aileen McLeod hailed the overall findings – but said more must be done.
Dr McLeod said: “Air pollution is harmful to human health and can contribute to climate change and I very much welcome the significant progress that has been made reducing emissions of nitrogen oxides and other air pollutants in Scotland.
“However, more needs to be done. The Scottish Government is already working closely with local authorities and other partners to improve air quality and the lives and well-being of communities and individuals across the country.
“Local authorities with air quality issues in their areas have in place local action plans to improve the situation, which can include measures such as promoting walking and cycling, for example, or greater use of cleaner vehicles.
“The forthcoming national Low Emission Strategy – which we consulted on earlier this year – will ensure greater consistency in approach across Scotland.”