Facts and statistics about air pollution in Norway
On cold days, high concentrations of wood-burning particles in the air can be a problem in densely populated areas.
Air pollution due to particulate matter (PM), nitrogen dioxide and ozone is a major cause of health problems and disease worldwide.
The purpose of the air quality criteria is to prevent health effects of air pollution. The criteria are set so low that most people can be exposed to these levels without any adverse effects on health.