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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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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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Are renovations performed on detached garages, sheds and other detached outbuildings on the property subject to the RRP Rule?
Yes. EPA interprets target housing to include pre-1978 buildings or structures that are (1) located on the residential portion of the property, and (2) associated with the residential use of the property. As a practical matter, the entire property of most urban and suburban residential lots is normally considered to…
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How do the RRP requirements apply to renovations on a pre-1978 building that contains both multi-room apartments (i.e., target housing) and zero-bedroom dwellings?
In pre-1978 buildings that contain a mix of target housing and zero-bedroom dwellings, the Lead Renovation, Repair, and Painting (RRP) Rule applies only to renovations performed in target housing and common areas. Common areas are those portions of a property generally accessible to residents/users of target housing, and can exist…
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Does zoning affect the target housing determination? For example, would a pre-1978 house that is zoned for commercial or office use, but used for residential purposes be considered target housing?
In determining whether a pre-1978 property is target housing, it is the actual or intended use of the property that matters, not its zoning classification. Therefore, a pre-1978 house that is used or intended to be used as a residence, even if only temporary, is target housing regardless of its…
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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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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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Does the term "target housing" mean just low income housing, or any home built before 1978 regardless of the financial status of the occupants?
Answer: “Target housing” means any housing constructed prior to 1978, except housing for the elderly or persons with disabilities (unless any child who is less than six years of age resides or is expected to reside in such housing) or any 0-bedroom dwelling. The income of the occupants of the…
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How would the Lead Renovation, Repair and Painting (RRP) Rule classify a pre-1978 property that is used for both residential and non-residential purposes?
EPA has interpreted target housing to include pre-1978 buildings or structures that are (1) located on the residential portion of the property, and (2) associated with the residential use of the property. In other words, if a portion of residential property is used for nonresidential purposes, the portion will nonetheless…
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