Question: A study by Bechtel, et al., 2009, in the Archives of Emironmental & Occupational Health considered polycyclic aromatic hydrocarbons and immune system function in beef

A study by Bechtel, et al., 2009, in the Archives of Emironmental & Occupational Health considered polycyclic aromatic hydrocarbons and immune system function in beef cattle. Some cattle were near major oil- and gas-producing areas of western Canada. The mean monthly exposure to PM1.0 (par- ticulate matter that is <1 m in diameter) was approximately 7.1 g/m with standard deviation

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