Study on toxic exposures in urban en...( ow-levels of pollutants such as chromiu...),Health

ow-levels of pollutants such as chromium and manganese, as well as from inhaling airborne transition metals. "With the large number of people who ride in underground subways, we do think subway exposures are worth investigating further," comments Dr. Chillrud. Along these lines, the Columbia researchers are beginning a study to look at whether the elements in airborne steel dust are absorbed into the bodies of transit workers in NYC.

The TEACH study suggests that subway systems would be conducive to health studies as well as comparison studies with different subway systems in order to better understand how design characteristics can effect air pollutant exposure levels. Dust produced in different subway systems could potentially have different levels and mixtures of elements. For example, the steel used in NYC was relatively devoid of nickel (Ni), but many types of steel do contain Ni as well as higher levels of Cr or Mn. And some subway systems use rubber wheels. The few published articles on other underground subway systems have primarily focused on increased levels of particulate matter mass or a single steel element such as iron. Nickel, manganese and chromium were identified in an amendment to the 1990 US Clean Air Act as among 189 Hazardous Air Pollutants potentially warranting ambient air regulation by the US Environmental Protection Agency.

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5-Jan-2004

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