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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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Does drilling holes in window frames to install window treatments such as shades and shutters qualify as minor repair and maintenance?
Yes, as long as the installation does not disturb more than six square feet of painted surface per room within a 30-day period. Question Number: 23002-15404 Find a printable PDF copy of all frequent questions pertaining to lead .
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If a renovator disrupts 20 square feet or less of painted surface per side on several sides of the exterior of one property, does the RRP Rule apply?
Yes. To qualify for the exception for minor repair and maintenance activities, the total amount of exterior paint disrupted must be 20 square feet or less. In addition, the job must not use prohibited practices or involve window replacement or demolition of painted surfaces. Question Number: 23002-18379 Find a printable…
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If I use a hammer to make a hole is a wall that is two feet on each side, does the RRP Rule apply?
Yes. Although making the hole disrupts less than six square feet of painted surface, using a hammer to make the hole is demolition of the surface, so the minor repair and maintenance exception does not apply. Making the hole using a cut-out technique that does not destroy the section of…
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When replacing an old wood door and frame with a new steel entry door and frame, how do I determine whether the job qualifies as a minor repair and maintenance activity?
When replacing an old wood door and frame with a new steel entry door and frame, how do I determine whether the job qualifies as a minor repair and maintenance activity? Do I calculate the amount of painted surface disrupted using the standard for interior renovations (six square feet or…
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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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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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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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My firm installs carpets. Sometimes there is no need to remove an existing carpet before installing the new carpet, but sometimes there is. How do I know when I need to comply with the Lead Renovation, Repair and Painting (RRP) Rule?
If when installing the carpet, you disrupt six square feet or less of painted surface per room, the job is not covered by the RRP Rule . Question Number: 23002-19749 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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