Particles occurring in the atmosphere with diameters less than 2 μm. This size range includes Aitken nuclei and particles in the accumulation mode.
Category of particulate matter with particles having a diameter of less than 2.5 micrometres, referred to as PM2.5.
Fine particles are an air pollutant mainly produced by cars running on diesel. Other sources are the combustion of fossil fuels in power plants and various industrial processes. Increased levels of fine particles in the air are linked to health hazards as Heart diseases, altered lung function and lung cancer.