Search Frequent Questions

Displaying 1 - 15 of 16 results

• 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…

  • Last published: January 7, 2025

• Is there any volume cap when using previously-retired 2008 or 2009 biodiesel RINs to satisfy an obligated party?s 2010 Biomass Based Diesel RVO? Can 2008 or 2009 biodiesel RINs that were previously-retired in 2009 also be used to satisfy Advanced Biofuel

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . 2008 and 2009 biodiesel and renewable diesel RINs (that is, RFS1 RINs with a D code of 2 and RR code of 15 or 17) used for compliance purposes in 2009 can also be used to reduce the…

  • Last published: August 2, 2024

• How complete are the data in the National Emissions Inventory?

  While the goal of the National Emissions Inventory (NEI) program is to include all emissions data, there are always challenges meeting this goal. The answer about completeness of coverage of sources depends on the emissions sector and pollutant. In general, the criteria air pollutants and precursors (CAPs) are expected to…

  • Last published: January 7, 2025

• Where is more information available about emissions estimation methods used by the EPA?

  For criteria air pollutants and precursors as well as for hazardous air pollutants, the methods are described in the technical support document (TSD) for the latest National Emissions Inventory (NEI) available from the main NEI page . For greenhouse gas emissions, you can find greenhouse gas inventory methods from the…

  • Last published: January 7, 2025

• Where are the NAICS/ SIC and SCC codes changes that have been implemented for the 2017NEI?

  Please refer to the NEI webpage for 2017 documentation , and follow the link for Appendix 2 - 2017 NEI Plan Code Changes. That Excel file describes anticipated changes for the SCCs and NAICS and includes a helpful read me. I'll just note in the next NEI/EIS email that SCC…

  • Last published: March 18, 2024

• The regulations at 80.1427(a)(7)(iii) say that 2008 biodiesel RINS + 2009 biodiesel RINs cannot exceed 20% of the 2010 RVO. Does this mean that 80% of the 2010 biomass-based diesel RVO has to come from 2010 RINs?

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The 20% rollover cap under RFS2 is the same as the rollover cap under the RFS1 program. However, the rollover cap only places a limit on previous year RINs that were NOT used for compliance in 2008 or…

  • Last published: July 24, 2024

• Is the volume of renewable fuels a fixed number of gallons? How does this affect an obligated party's requirements?

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The volume of renewable fuel used as the basis for calculating the percentage renewable fuel standards is fixed by CCA 211(o)(2)(B) for certain years (through 2012 for biomass-based diesel and 2022 for other renewable fuels), with volumes after…

  • Last published: August 2, 2024

• How are emissions trends compiled?

  For criteria air pollutants and precursors, the emissions trends are based on the triennial National Emissions Inventory data, with some interim year data included for non-triennial years. The methods and interim-year approaches are described on the “Development of Data” tab included with the data provided on the Air Pollutant Emissions…

  • Last published: January 7, 2025

• How do I determine what SCCs have changed between inventory years?

  These are available in the EIS (Reporting Code table) or public website: https://sor-scc-api.epa.gov/sccwebservices/sccsearch/ Filter on “last inventory year” to remove SCCs no longer active. If this column has a date in it, then the SCC has been retired as of that date. The “last updated date” (column J) indicates when…

  • Last published: January 23, 2025

• 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…

  • Last published: May 31, 2024

• Under section 80.1405, the standard for biomass based diesel (BBD) is calculated via a fraction, the numerator of which is equal to the RFV for BBD in compliance year i times 1.5. For 2010 only, would you agree that, using the example of the calculation f

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The percentage standard for biomass-based diesel in years 2011 and beyond will be based upon the volumes specified in CAA 211(o)(2)(B)(i)(IV), unless some portion of that volume is waived per CAA 211(o)(7)(E). For 2010, the numerator of the…

  • Last published: July 23, 2024

• Can 2009 Cellulosic Biomass ethanol RINs (with a D code of 1) be used to satisfy an obligated party?s Cellulosic Biofuel and/or Advanced Biofuel RVO in 2010? Is there a 20% rollover cap on this type of RIN being used to satisfy the Cellulosic and/or Advan

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . 2009 cellulosic biomass ethanol RINs with a D code of 1 that are not used for compliance purposes in 2009 can be used to meet the cellulosic biofuel, advanced biofuel, and total renewable fuel RVOs in 2010. The…

  • Last published: August 6, 2024

• 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…

  • Last published: August 15, 2024

• 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…

  • Last published: January 7, 2025

• I understand under CAA Section 211(o), compliance can be deferred for a year as long as the obligated party complies the next year. How does one petition for a one-year deferral? What criteria are considered?

  See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . According to §80.1427(b), an obligated party may carry a deficit from one compliance year to the next under certain conditions. No petition for a deficit carryover is required. An obligated party will be presumed to be carrying over…

  • Last published: July 24, 2024