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  • The FTP download is not working; what do I do?

    Option 1:  The FTP site is active, but some browsers are no longer supporting the ftp:// protocol.  You can access the same data by replacing “ ftp://newftp.epa.gov / ” with  “ https://gaftp.epa.gov/ ” and keep the rest of the URL the same.  The filenames you see will be shorter, but…

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  • What is meant by "molten" and "in solution" when describing extremely hazardous substances?

    To assist state and local officials in the development of emergency response plans, the Emergency Planning and Community Right-to-Know Act (EPCRA) requires the owner or operator of each facility at which an extremely hazardous substance (EHS) is present in an amount equal to or exceeding its threshold planning quantity (TPQ)…

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  • The point source maps are not working on the NEI data tab. What do I do?

    The point source maps use a web service provided by Envirofacts. Please report your problem to the Envirofacts “Contact Us” page here .

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  • What sources make up the Sectors or Tiers used in the emissions data summaries?

    Tier 1 and Sector categories are assigned by source classification codes (SCCs) that are the most specific processes available in the NEI. The latest SCC list with the Tier 1 and Sector assignments can be downloaded from the EPA SCC website in Comma Separate Values (CSV) format.

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  • Designating a facility subject to emergency planning requirements

    A natural gas distribution facility consists of a series of pipelines and breakout storage tanks. The substances stored at the facility are exempt from all applicable provisions of EPCRA (except Section 304) under the transportation exemption at Section 327. Can such a facility be designated (under the authority of Section…

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  • Are the GHGs in the National Emissions Inventory Complete?

    No, the 2020 National Emissions Inventory (NEI) does not comprehensively capture all sources and sinks of greenhouse gases (GHGs) in the United States. For this information, users should review the EPA’s annual Inventory of U.S. Greenhouse Gas Emissions and Sinks . However, the NEI does report GHG emissions for select…

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  • Call Center Support for EPCRA Regulations

    If I have additional questions regarding the EPCRA regulations, who can I contact via telephone for further assistance? You may contact the EPCRA, RMP & Oil Information Center, a publicly accessible service that provides up-to-date information on the regulatory requirements of EPCRA, including the emergency planning, emergency release notification, and…

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  • Where can I obtain the hourly data from Continuous Emissions Monitors (CEMs)?

    The CEM emissions data are available from the EPA Clean Air Markets Program Data website.

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  • What are EPA’s plans for the 2020 National Emissions Inventory given the atypical situation from COVID-19 that is impacting emissions? What will it be used for?

    The EPA intends to prepare a 2020 National Emissions Inventory in collaboration with state, local, and tribal air agency partners. The Air Emissions Reporting Rule (AERR) requires states and delegated local and tribal agencies to report emissions from stationary sources and provide model inputs for onroad and nonroad sources (except…

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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 have 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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  • What is the definition of VOC?

    There is a regulatory definition of VOC. It is found in 40 CFR 51.100. CFR - code of federal regulations. The definition relates to the intent and requirements of the Clean Air Act. Excerpt from “Volatile Organic Compounds” Definition per 40 CFR Part 51.100(s): " Volatile organic compounds (VOC) means…

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  • How can I get more detailed information? What measurements/sensors are used to measure emissions?

    Access the latest NEI data set . Under 'Sector Summaries - Criteria and Hazardous Air Pollutants by 60 EIS emission sectors', > choose National > for Pollutant, choose PM10 Primary and/ or PM2.5-PRI > Sector, choose all sectors >Submit Query to see results at bottom of page. Open the results…

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  • What does "NEC" stand for in the emissions sectors?

    NEC means “not elsewhere classified” and includes SCCs that are not assigned to any of the other specific industrial process sectors. If you look at the SCC code table available at the SCC web site and filter on the Sector name that includes “NEC”, you can see the type of…

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  • EPCRA implementation on Tribal Lands

    In 1986, Congress passed the Emergency Planning and Community Right-to-Know Act (EPCRA), also known as Title III of the Superfund Amendments and Reauthorization Act (SARA), to help local communities, including Indian reservations, protect public health and the environment from chemical hazards by informing citizens about the chemicals present in their…

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