By origin:

-Pollutants of natural origin, e.g. volcanic eruption gases, vapours.

-Pollutants of artificial origin, e.g. combustion products emitted by aviation.

By state of formation:

-gaseous, e.g. carbon dioxide, carbon monoxide

-liquid, e.g. acid, alkaline vapours -solid e.g. soot, fly ash.

By chemical composition:

-organic e.g. fungal spores, viruses, bacteria

-inorganic pollutants.

By their harmful effects:

-health and infectious effects

-greenhouse effect

-damage to the ozone shield

-Contribution to smog formation


-acid rain, deforestation.

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