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Pentachlorophenol (PCP) is a good example of a nasty environmental pollutant .
Unfortunately for hayfever sufferers, pollen is a natural pollutant of the air.
air pollutant
There are no direct data to assess the potential effects of contamination by air-borne pollutants on arctic insects.
The emphasis is not on taxing pollutants or simply outlawing pollutants .
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