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Photochemical smog
A mixture of pollutants that are formed when nitrogen oxides + volatile organic compounds react to sunlight
VOCs
Volatile Organic Compounds
Primary Pollutants
Emitted directly from the polluting process, e.g. Carbon monoxide
Secondary Pollutants
When primary pollutants undergo reactions with other chemicals already present in the atmosphere, e.g. Tropospheric ozone
Volatile Organic Compounds
Emitted as gas from certain solids or liquids