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Portland, Oregon Air Toxics Assessment (PATA)

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Portland Air Toxics Assessment (PATA) is a computer modeling project to estimate local levels of 12 air toxics based on where they come from, and where they could be concentrated. PATA is the first local scale air toxics modeling project conducted in Oregon as part of the developing state Air Toxics Program. The U.S. Environmental Protection Agency (EPA) has conducted a National Air Toxics Assessment (NATA), which provides pollutant estimates on a larger scale. PATA refines the national modeling by using the Department of Environmental Quality's (DEQ's) most current pollution information, including emissions from motor vehicle traffic, and factors in weather and topography (the shape of the land).

The DEQ expects this study to give a better understanding of air toxics in Portland by producing a more accurate estimate of the most significant air toxics. While NATA provided pollutant estimates at the county level, PATA will yield information for smaller areas, like neighborhoods. This will help DEQ develop geographically based strategies to reduce people's exposure to air toxics. PATA is a collaborative effort between DEQ and EPA, with key contributions from Metro regional government.

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