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A gas that is mainly produced during the combustion of fossil fuels, along with nitric oxide.
Emitted as gases from certain solids or liquids.
Extremely fine particulates with a diameter of fewer than 1 microns.
Have a diameter of less than 2.5 microns.
Particles have a diameter less than 10 microns, or 100 times smaller than a millimetre
AIR POLLUTION INDEX