New findings on emerging contaminants(determined to have systems comparable to...),Health

What isnt good for them, isnt good for us, Incardona says. Given the amount of PAH emissions that come out car tailpipes daily, especially in dense, urban areas, basically, we are breathing an aerosolized oil spill. He says PAHs should be considered as prime suspects for cardiovascular impacts related to air pollution.

Scholz is also finding that although the effects of a single chemical may not be deadly, combinations of chemicals in our environment can be more potent. Pesticides are regulated one by one, but in the environment they can mix with other pesticides and such mixtures are not regulated.

Water quality monitoring of rivers and streams has shown that threatened and endangered coho salmon and steelhead habitats throughout the Northwest are widely contaminated with pesticides that have run off from urban areas and agricultural land. The researchers looked at mixtures of five common insecticides and found that some combinations were much more toxic to the juvenile salmon than any one of the chemicals acting alone. The researchers say the enhanced toxicity of pesticide mixtures could be a more important factor in salmon population declines than previously realized.

Current risk assessments based on a single chemical will likely underestimate impacts on wildlife in situations where that chemical interacts with other chemicals in the environment, says Scholz. The current findings may have implications for human health because these insecticides act on the nervous systems of salmon and humans in a similar way. Also, mixtures of pesticide residues can be common in the human food supply.

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