turers, the HEI describes itself as an “unbiased source of information on the health effects of motor vehicle emissions.”10 The HEI was given the task of reanalyzing and validating the original data.

The HEI organized an open, international competition to assemble a “reanalysis team” and established a separate review committee to examine the results of the reanalysis. The review involved a sensitivity analysis using methods not available during the original analysis and an examination of new data. The HEI found the original data to be of high quality, and essentially confirmed the validity of the original findings and conclusions.


The following description of the HEI, located in Boston, Mass., is offered on its web site: “The Health Effects Institute (HEI) is an independent, nonprofit corporation chartered in 1980 to provide high-quality, impartial, and relevant science on the health effects of pollutants from motor vehicles and from other sources in the environment. Supported jointly by the U.S. Environmental Protection Agency (EPA) and industry, HEI has funded over 170 studies and published over 100 Research Reports and several Special Reports producing important research findings on the health effects of a variety of pollutants, including carbon monoxide, methanol and aldehydes, nitrogen oxides, diesel exhaust, ozone, and most recently, particulate air pollution.” See http://www.healtheffects.org/pubsspecial.htm.

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