If the contamination results in harm to life or object, then this is considered air pollution. The trick is to determine at what level of contamination does harm occur, because at very low concentrations, that contaminant may not affect anyone.
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Once we define the "normal" concentration of gases in the atmosphere,
a change to this composition constitutes a contamination. This is not sufficient
for defining air pollution, because if the contaminant does no harm, then no
one really cares that it's in the air.
If the contamination results in harm to life or object, then this is considered air pollution. The trick is to determine at what level of contamination does harm occur, because at very low concentrations, that contaminant may not affect anyone. |
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Here's a long-winded, legalese-filled "definition" for air pollution. Note the "weasel words". |
