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Where can I find older NEI data (prior to 2008)?
The raw data and summaries that are still available (dating back to 1990) can be obtained from the web page https://www.epa.gov/air-emissions-inventories/pollutant-emissions-summary-files-earlier-neis . Starting with 2001 data, a more limited selection of summary files are available.
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How do the different parts of particulate matter (PM) fit together?
The various parts of PM in the NEI are related as follows. PM10-FIL > PM25-FIL because PM10-FIL includes PM25-FIL PM25-PRI = PM25-FIL + PM-CON This equation only applies at the process level. Because some sources only can report PM2.5 (due to test method differences), this equation does not apply to…
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How does PM2.5 relate to PM species such as EC, OC, SO4, NO3, PMFINE, and DIESEL-PM25?
Primary PM2.5 estimates are speciated into the five PM species in the NEI: elemental (black) carbon (EC), organic carbon (OC), nitrate (NO3), sulfate (SO4), and the remainder of PM25-PRI (PMFINE). Diesel engine PM25-PRI and PM10 emissions are also labeled as DIESEL-PM25 and DIESEL-PM10 for mobile source diesel engines. For all…
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What is the Tier 2 Vehicle & Gasoline Sulfur Program?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The Tier 2 Vehicle and Gasoline Sulfur Program is a landmark program, begun in January 2004, that affects every new passenger vehicle and every gallon of gasoline sold in the U.S. By designing cleaner cars that run on…
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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…
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How do I register renewable gasoline?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Manufacturers/importers of renewable gasoline for on-road use are required to register the fuel with the EPA. To register, see: Register or Update a Fuel or Fuel Additive Request under 40 CFR Part 79 . Please indicate “renewable gasoline”…
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Where can I find the public list of registered fuels and fuel additives?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . An online list of fuels and fuel additives registered with EPA is located here: Register or Update a Fuel or Fuel Additive Request under 40 CFR Part 79 .
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How do I register renewable diesel?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Manufacturers/importers of renewable diesel for on-road use are required to register the fuel with the EPA. To register, see Register or Update a Fuel or Fuel Additive Request under 40 CFR Part 79 . Please indicate “renewable diesel”…
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What sources make up the Tier 1 categories used in the emissions trends?
Tier 1 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 assignments can be downloaded from the EPA SCC website in Comma Separate Values (CSV) format.
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What is the cause of the large decrease in electric utility emissions, particularly sulfur dioxide, starting in 1995?
SO2 emissions reductions from utilities during this time are primarily attributed to the impacts of the acid rain program. As described on EPA’s Acid Rain Program web page, Phase 1 of this program began in 1995 and affected 263 units at 110 most coal-burning electric utility plants in 21 eastern…
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Can I get access to the Emissions Inventory System if I am not a data provider to EPA?
The Emission Inventory System (EIS) is a secured database for EPA and State/Local and Tribal Air Agencies only. The EIS is used to develop the National Emission Inventory (NEI). While you cannot have access to EIS, you can have access to the current and past NEIs through EPA’s NEI website…
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Can a refiner or importer use gasoline sulfur test methods other than ASTM D 2622-98, especially for sulfur levels of 10 ppm and less?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The rule designates ASTM D 2622 as the benchmark test method by which compliance will be determined, and that is the test that the Agency typically will use in establishing compliance. However, the rule does permit alternative test…
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There is significant difference between "refiner" and "refinery". Portions of the regulations use "refiner" where "refinery" is the appropriate term. While it may be clear from the context that "refinery" is meant, text should be changed to avoid any poss
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . We agree with the comment and intend to make these clarifications in a future rulemaking. These clarifications would not affect the regulatory requirements in the current final rule.
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When do I get an EPA assigned fuel ID/additive ID?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . You will receive your assigned ID after registering your fuel and/or fuel additive with EPA.
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Are biogenic emissions included in the emissions trends Tier 1 data?
No, the biogenic emissions are not included in the emissions trends Tier 1 data. If needed, users can add the biogenic data either as a separate Tier, or specify its inclusion in the “Miscellaneous” Tier 1 group.
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