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Pollutant Filter
NO
2
A gas that is mainly produced during the combustion of fossil fuels, along with nitric oxide.
VOC
Emitted as gases from certain solids or liquids.
PM
1
Extremely fine particulates with a diameter of fewer than 1 microns.
PM
2.5
Have a diameter of less than 2.5 microns.
PM
10
Particles have a diameter less than 10 microns, or 100 times smaller than a millimetre
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AIR POLLUTION INDEX
LOW
MEDIUM
HIGH
