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

The Nonattainment Area - 8 hr Ozone (1997) 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 (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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• Organization: U.S. Environmental Protection Agency
• Updated: 2019-12-31

Files containing daily maximum 8-hr ozone mixing ratio observations and WRF/CMAQ simulations that were contributed by EPA/ORD/CEMM/AESMD researchers to the manuscript “Assessing the manageable...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2017-01-01

Files containing daily maximum 8-hr ozone mixing ratio observations used in the analysis presented in the manuscript “A New Method for Assessing the Efficacy of Emission Control Strategies to...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2015-06-30

Files containing daily maximum 8-hr ozone mixing ratio observations and WRF/CMAQ simulations used in the analysis presented in the manuscript “Dynamic Evaluation of Two Decades of WRF-CMAQ Ozone...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2020-01-01

Figure 2. Cell non-heme iron concentrations following 4 (A) and 24 (B) hr exposures of BEAS-2B cells to media, carbon black treated with air (CB-Air), carbon black treated with ozone (CB-O3), and...

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

The Nonattainment Area - 1 hr Ozone (1979) 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: U.S. Environmental Protection Agency
• Updated: 2017-01-01

Files containing daily maximum 8-hr ozone mixing ratio observations and WRF/CMAQ simulations that were contributed by EPA/ORD/NERL/CED researchers to the manuscript “On the Limit to the Accuracy...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2015-07-22

This is a NetCDF file in ioapi format that contains the probability that ozone is above the 8 hr max O3 standard for the four days of the simulation. This dataset is not publicly accessible...

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

This downloadable data package contains the following state level layers: Ozone 8-hr (1997 standard), Ozone 8-hr (2008 standard), Lead (2008 standard), SO2 1-hr (2010 standard), PM2.5 24hr (2006...

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

This web service contains the following state level layers:Ozone 8-hr (1997 standard), Ozone 8-hr (2008 standard), Lead (2008 standard), SO2 1-hr (2010 standard), PM2.5 24hr (2006 standard), PM2.5...

• Organization: U.S. Environmental Protection Agency
• Updated: 2016-06-15T00:00:00.000+00:00

This web service contains a polygon layer that depicts fused air quality predictions for 2012, 2013, and 2014 for census tracts in the conterminous United States. Fused air quality predictions...

• 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...