Template:Human exposure to fine particles

Human exposure to fine particles

Fine particles are particles smaller than 2.5 µm of aerodynamic diameter. They are often produced by combustion processes, and they enter human breathing zone both outdoors and indoors. Fine particles are considered the most dangerous air pollution to health. The average exposure to fine particles in Finland is in the order of 10 µg/m3 (one millionth of a gram in one cubic metre of air). A large fraction of fine particle exposure comes as long-range transport from hundreds or even thousands of kilometres away. The most important emission sources in Finland are domestic combustion and traffic.