What are Fine Particles?
Fine particles are microscopic air-borne solid matter. They include natural material such as sea salt and volcanic ash. However, a substantial amount is generated from man-made sources such as industrial processes, the combustion of fuels and movement of road traffic. Particles less than 10µm in size (10 millionths of a metre) are considered most likely to be deposited in the lung. Particles are measured in microgrammes per cubic metre (µg/m3).
