(1) air pollutant(2) Unfortunately for hayfever sufferers, pollen is a natural pollutant of the air.(3) Pentachlorophenol (PCP) is a good example of a nasty environmental pollutant .(4) Computer models of water currents can also be used to predict the fate of pollutants released into the water.(5) At each link in the chain, the concentration of pollutants increases.(6) The finding could help determine the background levels of various water pollutants .(7) Recently attention has been focused on the assessment of biological risks of low-level exposure to environmental pollutants .(8) There are no direct data to assess the potential effects of contamination by air-borne pollutants on arctic insects.(9) Habitats in San Francisco Bay are impaired by pollutants including mercury.(10) The emphasis is not on taxing pollutants or simply outlawing pollutants .(11) However, some studies also focused on the mechanisms by which particles without organic pollutants cause carcinogenic effects.