Pentachlorophenol (PCP) is a good example of a nasty environmental pollutant .
Unfortunately for hayfever sufferers, pollen is a natural pollutant of the air.
There are no direct data to assess the potential effects of contamination by air-borne pollutants on arctic insects.
At each link in the chain, the concentration of pollutants increases.
The finding could help determine the background levels of various water pollutants .
The emphasis is not on taxing pollutants or simply outlawing pollutants .
Recently attention has been focused on the assessment of biological risks of low-level exposure to environmental pollutants .
Habitats in San Francisco Bay are impaired by pollutants including mercury.
However, some studies also focused on the mechanisms by which particles without organic pollutants cause carcinogenic effects.