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Access to EPA Air Pollution Data & Maps

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Source: EPA

AirData : Access to Air Pollution Data

The AirData Web site gives you access to air pollution data for the entire United States. Want to know the highest ozone level measured in your state last year? Ever wonder where air pollution monitoring sites are located? Are there sources of air pollution in your town? You can find out here! AirData produces reports and maps of air pollution data based on criteria that you specify.

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Disclaimer: Information for this report comes from an extract of EPA's National Emission Inventory (NEI) database. Data were extracted in August 2004 (1999 emissions) and August 2008 (2002 emissions). EPA compiles the NEI using various sources of data, described in NEI documentation. The five primary data sources are: (1) emissions inventories developed by state and local air pollution control agencies, (2) databases related to EPA's Maximum Achievable Control Technology programs to reduce HAP emissions, (3) Toxic Release Inventory data, (4) emissions estimated by using mobile source methodology developed by experts in EPA's Office of Transportation and Air Quality, and (5) area source emission estimates generated using emission factors and activity data. Although the NEI is based partially on emission data obtained from state and local agencies, it is not a database of official state emissions data. Please contact the appropriate state agency to obtain information on a state's official emission inventory. Please contact EPA to report errors.

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Consistency: The NEI is a composite of emission estimates generated by state and local regulatory agencies, industry, and EPA. Because the estimates originated from a variety of sources and estimation methods, as well as differing purposes, they vary in quality, level of detail, and geographic coverage. However, this compilation of emissions estimates represents the best available information to date.

Variability in quality and accuracy of emission estimation methods in the NEI: The accuracy of emission estimation techniques vary with pollutants and source categories. In some cases, an estimate may be based on a few or only one emission measurement at a similar sources. The techniques used and quality of the estimates will vary between source categories (e.g., some have been better studied that others) and between major, area and other, and mobile source sectors.

Readers are cautioned not to infer a qualitative ranking order of geographic areas based on AirData reports. Air pollution levels measured in the vicinity of a particular monitoring site may not be representative of the prevailing air quality of a county or urban area. Pollutants emitted from a particular source may have little impact on the immediate geographic area, and the amount of pollutants emitted does not indicate whether the source is complying with applicable regulations.

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