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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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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 I certify a nonroad flexible-fuel engine under 40 CFR Part 1054, are owners and operators prohibited from using gasoline-ethanol blended fuels containing greater than 10 volume percent ethanol under 40 CFR 80.1504(a)(1) in my nonroad flexible-fuel engi
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . No, owners and operators of nonroad engines, vehicles, and equipment where the nonroad engine is certified under 40 CFR Part 1054 as a flexible-fuel engine are not prohibited from using gasoline-ethanol blended fuels containing greater than 10 volume…
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The FTP download is not working; what do I do?
Option 1: The FTP site is active, but some browsers are no longer supporting the ftp:// protocol. You can access the same data by replacing “ ftp://newftp.epa.gov / ” with “ https://gaftp.epa.gov/ ” and keep the rest of the URL the same. The filenames you see will be shorter, but…
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The point source maps are not working on the NEI data tab. What do I do?
The point source maps use a web service provided by Envirofacts. Please report your problem to the Envirofacts “Contact Us” page here .
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What sources make up the Sectors or Tiers used in the emissions data summaries?
Tier 1 and Sector 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 and Sector assignments can be downloaded from the EPA SCC website in Comma Separate Values (CSV) format.
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Where can I obtain the hourly data from Continuous Emissions Monitors (CEMs)?
The CEM emissions data are available from the EPA Clean Air Markets Program Data website.
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How can I get more detailed information? What measurements/sensors are used to measure emissions?
Access the latest NEI data set . Under 'Sector Summaries - Criteria and Hazardous Air Pollutants by 60 EIS emission sectors', > choose National > for Pollutant, choose PM10 Primary and/ or PM2.5-PRI > Sector, choose all sectors >Submit Query to see results at bottom of page. Open the results…
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How do I download the data from the “Data Summaries” tab on the NEI data pages?
On these pages after you run a query, there should be icons that at the top of the data table generated by your query. These icons look like this: COPY CSV EXCEL PDF PRINT If these icons do not appear, it is because Adobe Flash is being blocked by your…
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Can product codes satisfy the product transfer documentation requirements set forth at 40 C.F.R. 80.1503(a)?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . EPA believes that parties normally are able to meet the product transfer requirements by including the required information in the documents that the parties currently use to memorialize the transfer of title or custody of the gasoline. Product…
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Where can I get maps and/or emissions of facility emissions data?
The EPA provides emissions maps in two ways. First, each of the last three NEI years have a “Facility Mapping” tab available on the main NEI page for that inventory year (for example, see the 2020 NEI page). With this tool, maps can be created for one state at a…
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