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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 defined as a structure (home or place of business)?

    While generally defined as a building, a structure under the structural cleaning program will include only those habitable spaces where indoor occupancy is frequent and regularly occurring on a daily or near-daily basis. Examples of residential structures include primary residences and living spaces, and examples of commercial structures include offices…

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  • Why is cleaning of homes and places of businesses happening?

    Norfolk Southern, with EPA oversight, is providing indoor cleaning to eligible occupants in response to concerns about the impact of the derailment and cleanup work on homes and places of businesses. The cleaning is to address potential dust that may have been generated as part of the train derailment and…

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  • Is my home unsafe if it contains lead-based paint?

    Answer: Approximately three-quarters of the nation’s housing built before 1978 contains some lead-based paint. This paint, if properly managed and maintained, poses little risk. If allowed to deteriorate, lead from paint can threaten the health of occupants, especially children under six years old. If families and building owners are aware…

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  • Can the inspection/risk assessment period for testing a house for lead be waived?

    Answer: Yes. The inspection or risk assessment period can be lengthened, shortened, or waived by mutual written consent between the purchaser and the seller. Question Number: 23002-33224 Find a printable PDF copy of all frequent questions pertaining to lead .

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  • As a seller and lessor, what if I'm selling target housing?

    Answer: Property owners who sell target housing must: Disclose all known lead-based paint and lead-based paint hazards in the housing and any available reports on lead in the housing; Give buyers the EPA pamphlet "Protect Your Family from Lead in Your Home"; Include certain warning language in the contract as…

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  • What if the lessor knows that there is no lead-based paint in my rental housing?

    Answer: If your rental housing has been found to be free of lead-based paint by a certified inspector, the Real Estate Notification and Disclosure Rule does not apply. Question Number: 23002-33220 Find a printable PDF copy of all frequent questions pertaining to lead .

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  • What if the buyers/renters don't speak English?

    Answer: In cases where the buyer or renter signed a purchase or lease agreement in a language other than English, the rule requires that the disclosure language be provided in the alternate language. " Protect Your Family From Lead In Your Home " in English. Protect Your Family From Lead…

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  • What work still needs to be done at the derailment site?

    Although contaminated soil has been excavated and removed from the derailment site, some additional work remains. Soil sampling continues to check all areas where cleanup operations took place. Stream assessments continue, and culvert clean out has started. Groundwater and drinking water sampling also continues. Expect these investigations and possible additional…

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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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  • Will regulated entities have to perform retroactive requirements based off of the November 12, 2024 final rule entitled “Reconsideration of the Dust-Lead Hazard Standards and Dust-Lead Post-Abatement Clearance Levels” (89 FR 89416)?

    Answer: No. The November 12, 2024 final rule entitled “Reconsideration of the Dust-Lead Hazard Standards and Dust-Lead Post-Abatement Clearance Levels” (89 FR 89416) does not impose retroactive requirements to regulated entities that have previously complied with the Disclosure Rule. In accordance with 40 CFR 745.107, a seller or lessor generally…

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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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