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Concepts list for air

ozone layer	purification
ozone layer depletion	purification facility
partially halogenated chlorofluorohydrocarbon	purification plant
particle separator	purifying power
permissible exposure limit	rain
peroxyacetylnitrate	rain water
photochemical agent	rainout
photochemical oxidant	refrigerant
photochemical pollution	respiratory protection apparatus
photochemical reaction	rotary furnace
photochemical smog	seal (technical)
pollution indicator	sludge incineration
pollution load	small-scale furnace
propagation process	smog
public emergency limit	smog warning

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