Science & Technology

This page shows all of the pages at www.epa.gov that are tagged with Science & Technology.

  • What does an annual emissions value in the NEI represent (one year or multiple years)?

    The NEI provides total annual emissions for a single year.

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  • WhAEM2000 BBM Files - Afton, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Afton Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • How do I get access to the Emissions Inventory System?

    Access to the Emissions Inventory System (EIS) is available to state, local, Tribal agencies, their representatives (such as contractors), to multijurisdictional organizations (MJOs), and to EPA staff. The EIS is not available to the public. Instructions for access to the EIS is available in the Emissions Inventory System (EIS) User’s…

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  • WhAEM2000 BBM Files - Shirley Basin, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Shirley Basin Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Torrington, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Torrington Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Reno Junction, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Reno Junction Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Recluse, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Recluse Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • How often are the NEI data updated and how frequently are the data published?

    The full NEI is created for every third inventory year (e.g., 2008, 2011, 2014, and 2017). The data for each version has been updated two times each for the 2008, 2011, and 2014 NEI cycles. For the 2017 NEI and beyond, the EPA is trying to publish only a single…

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  • WhAEM2000 BBM Files - Rawlins, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Rawlins Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Preston, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Preston Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Newcastle, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Newcastle Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Ogden, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Ogden Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Medicine, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Medicine Bow Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Gannett Peak, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Gannett Peak Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • WhAEM2000 BBM Files - Kaycee, Wyoming

    WhAEM2000 (Wellhead Analytic Element Model) binary base map browser for Kaycee Quadrangle, Wyoming. Files serve as geographic basis for groundwater modeling.

  • What are the units of NEI emissions data?

    NEI emissions values represent total annual emissions for the inventory reporting year. Criteria air pollutants and precursors (CAPs) are reported in short tons per year, and hazardous air pollutants (HAPs) are reported in lbs per year.

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  • Where can I download hourly emissions data from continuous monitoring?

    Hourly emissions data files are available from the Clean Air Markets Division of EPA, collected as part of 40 CFR Part 75. The download location has changed in February, 2023. The new location is https://campd.epa.gov/data/bulk-data-files. Once on this new site, use the menu (at the left) and the Keyword search…

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  • How do I reset my password for the Emissions Inventory System?

    Instructions for resetting your password are available in the Emissions Inventory System (EIS) User’s Manual and How To’s section on “How Do I Update My Password?” Follow the instructions to reset your password.

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  • Where can I get maps and/or emissions of facility emissions data?

    The EPA provides emissions maps in two ways. First, each of the last three NEI years has a “Facility Mapping” tab available on the main NEI page for that inventory year (for example, see the 2020 NEI page). With this tool, maps can be created for one state at a…

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  • How are Oxides of Nitrogen (NOx) defined in the NEI?

    For all source categories, NOx is compiled from emissions measurements that express NOx mass based on the molecular weight of nitrogen dioxide (NO2), which is 46. Even though emission streams initially consist mainly of NO from most sources, this expression of NOx by NO2 MW is appropriate due to the…

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