Norman W. Fichthorn

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State environmental regulators are beginning to develop plans designed to meet more stringent air quality standards under the Clean Air Act (CAA), including standards to protect against unhealthful levels of ground-level ozone. In doing so, many states are looking more closely at a factor that contributes to their air quality problems but that they lack any authority to address: the phenomenon of air pollution carried by prevailing winds into their jurisdictions from emission sources located…
The phrase “interstate transport” conjures images of planes, trains and trucks carrying people and goods cross-country. But, under the federal Clean Air Act (CAA), the term is often used to refer to interstate air pollution—emissions from factories, power plants, motor vehicles, refineries and other sources that are transported by prevailing winds across state lines, sometimes over hundreds of miles. The interstate transport phenomenon often has posed for the US Environmental Protection Agency (EPA) what the…