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Remove all filtersDisplaying 1 - 15 of 44 results
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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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May I generate RINs that I produced and sold for non-road use in the past so that I can reinstate those RINs under RFS2?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Section 80.1426(c)(2) provides that RINs are assigned to a volume of renewable fuel when ownership of the RIN is transferred along with ownership of the volume of renewable fuel. A comparable provision appear in the RFS1 regulations, at…
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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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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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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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May I generate RINs for renewable fuel that I produced and sold for non-motor vehicle use in the past so that I can reinstate those RINs under RFS2?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . No. RINs that were previously generated in 2009 and 2010 may be reinstated if they were retired for non-motor vehicle use. However, RINs may not be generated for renewable fuel produced in the past in order to retire…
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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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If a certified inspector or risk assessor determines that a component was installed post-1978 and is therefore free of lead-based paint, can the renovation firm rely on this determination?
Yes, as long as the renovation firm has obtained a copy of the determination. The firm must retain a copy of the determination for three years after completion of the renovation. Question Number: 23002-18218 Find a printable PDF copy of all frequent questions pertaining to lead .
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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…
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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…
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In addition to 2009 RINs, may a party reinstate 2008 and 2010 RINs that were retired for non-road use under RFS1?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Pursuant to §80.1429(g), any 2009 RINs that were retired for non-motor vehicle, heating oil or jet fuel use under RFS1 may be reinstated under RFS2. The regulations do not allow 2008 RINs to be reinstated. Since RFS1 RINs…
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How does a retiring party reinstate RFS1 RINs that were retired because renewable fuel was ultimately used for non-motor vehicle, heating oil or jet fuel purposes? What steps are required to be taken and do any codes require changing?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Pursuant to §80.1429(g), parties may reinstate 2009 RINs that were retired under RFS1 because the renewable fuel was ultimately used in a non-motor vehicle application, heating oil or jet fuel. As stated in question 11.1, since RFS1 RINs…
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