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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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  • Owner / Operator Compliance Audit Timeline

    The regulations in 40 CFR §§68.58 and 68.79 require the owner or operator of facilities to conduct and document compliance audits at least every three years, although an owner or operator is not required to conduct a compliance audit prior to submitting a facility’s first RMP. Must an owner or…

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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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  • How do I download the data from the “Data Summaries” tab on the NEI data pages?

    On these pages after you run a query, there should be icons that at the top of the data table generated by your query. These icons look like this: COPY CSV EXCEL PDF PRINT If these icons do not appear, it is because Adobe Flash is being blocked by your…

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  • Why do mobile source NOx emissions jump higher between 2001 and 2002 on the emissions trends?

    The emissions model used for mobile sources changed from MOBILE6.2 to MOVES 2010 in December 2009. This change included a notable increase in NOx emissions. The EPA adjusted data back to 2002 to reflect the change in models. The higher emissions in 2002 are because of this method change and…

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  • Program Level 2 and 3 compliance audits

    Facilities with Program Level 2 and 3 processes must perform compliance audits at least once every three years (40 CFR §§68.58 and 68.79). How does a facility submit its compliance audit to EPA? Facilities are not required to submit three year compliance audits to EPA; however, facilities should maintain records…

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  • Maintenance requirements for leased tanks

    I use propane as a raw material in my manufacturing process. I lease the tank from the propane supplier. The supplier does all the maintenance. My staff never work on the equipment. What should I do? As part of your contract with the supplier, it would be helpful to gain…

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  • When must an incident investigation be initiated for Program 2 and 3 processes?

    When must a stationary source owner or operator begin conducting incident investigations as required under 40 CFR §68.60 (for Program 2 processes) or 40 CFR §68.81 (for Program 3 processes)? For both Program 2 and Program 3 processes, the incident investigation must be initiated as soon as possible, but not…

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  • Breaking a process into separate units to comply with prevention program requirements

    Do I have to do my hazard review, process hazard analysis, or other prevention activity on the whole process or can I break it into separate units? Once you have determined that you have a covered process, you can divide the covered process any way you want to implement the…

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