• Organization: U.S. Environmental Protection Agency
• Updated: 2015-11-18T00:00:00.000+00:00

This GIS dataset contains points which depict air quality monitors within EPA's Air Quality System (AQS) monitoring network. This dataset is updated weekly to reflect the most recent changes in...

• Organization: U.S. Environmental Protection Agency
• Updated: 2017-04-20T00:00:00.000+00:00

This map service contains participants in EPA's Air Quality Flags Program. The map service also includes the current day's AQI forecast for each participant in the program. The Air Quality Flag...

• Organization: U.S. Environmental Protection Agency
• Updated: 2016-04-11T00:00:00.000+00:00

This web service contains layers that depict annual emissions for 2014 at the facility and county level for the following criterial pollutants: CO, Lead, NH3, NOx, PM10, PM25, SO2, and VOC. The...

• Organization: U.S. Environmental Protection Agency
• Updated: 2014-01-01

OAR's RACT, BACT, LAER Clearinghouse (RBLC) data asset contains summary information on selected air permitting actions from EPA, state, and local permitting agencies across the U.S., as well as a...

• Organization: U.S. Environmental Protection Agency
• Updated: 2009-01-01T00:00:00.000+00:00

This data layer identifies areas in the U.S. where air pollution levels have not met the National Ambient Air Quality Standards (NAAQS) for 2006 PM-2.5 standards. These areas were designated...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2015-09-22T00:00:00.000+00:00

This downloadable package contains the following layers: Mandatory Class 1 Federal Area polygons in the United States. Included in this package are a file geodatabase, Esri ArcMap map document and...

• Organization: U.S. Environmental Protection Agency
• Updated: 2015-07-01T00:00:00.000+00:00

This web service layer, Carbon Monoxide (1990 NAAQS), displays identified state level areas where carbon monoxide pollution has not met the National Ambient Air Quality Standards (NAAQS)...

• Organization: U.S. Environmental Protection Agency
• Updated: 2015-09-22T00:00:00.000+00:00

This web service contains the following layers: Mandatory Class 1 Federal Area polygons and Mandatory Class 1 Federal Area labels in the United States. The polygon layer draws at all scales. The...

• Organization: U.S. Environmental Protection Agency
• Updated: 2017-08-28

Annual air trends report in the form of an interactive web application. The report features a suite of visualization tools that allow the user to: -Learn about air pollution and how it can affect...

• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - Lead (Pb-2008) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2014-01-01

The Emissions Modeling Clearinghouse (EMCH) supports and promotes emissions modeling activities both internal and external to the EPA. Through this site, the EPA distributes and documents...

• Organization: U.S. Environmental Protection Agency
• Updated: 2015-07-01T00:00:00.000+00:00

This web service layer, Ozone 8-hr (2015 standard), displays identified state level areas where ground-level ozone have not met the National Ambient Air Quality Standards (NAAQS) established in...

• Organization: U.S. Environmental Protection Agency
• Updated: 2014-01-01

EPA regulations codified in 40 CFR Part 60 and 63 require affected sources to perform emissions source tests, conduct continuous emissions monitoring, and submit compliance and emissions reports ....

• Organization: U.S. Environmental Protection Agency
• Updated: 2014-01-01

The Air Emissions Trends site provides national trends of criteria pollutant and precursor emissions data based on the the National Emissions Inventory (NEI) from 1970 - the latest NEI year.

• Organization: U.S. Environmental Protection Agency
• Updated: 2015-09-23

OAR's RACT, BACT, LAER Clearinghouse (RBLC) data asset contains summary information on selected air permitting actions from EPA, state, and local permitting agencies across the U.S., as well as a...

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• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - Carbon Monoxide (CO-1971) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation...

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• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - Particulate Matter-2.5 (2012) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation...

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• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - Nitrogen Dioxide (NO2-1971) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation...

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• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - 8 hr ozone (2015) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation (USDOT)/Bureau...

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• Organization: Department of Transportation
• Updated: 2025-12-13T00:00:00.000+00:00

The Nonattainment Area - 8 hr ozone (2008) dataset was updated on November 30, 2025 by the Environmental Protection Agency (EPA) and is part of the U.S. Department of Transportation (USDOT)/Bureau...

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