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Displaying 1 - 8 of 8 results
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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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Is the last date of sampling 12/31/2029?
Yes, that is correct. The last date of sampling is 12/31/2029.
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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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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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Why do mobile source NOx emissions jump higher between 2001 and 2002 on the emissions trends?
The emissions model used for mobile sources changed from MOBILE6.2 to MOVES 2010 in December 2009. This change included a notable increase in NOx emissions. The EPA adjusted data back to 2002 to reflect the change in models. The higher emissions in 2002 are because of this method change and…
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Why do the PM2.5 emissions for the electric utilities source category jump up between 1998 and 1999?
The estimation method for PM emissions from fuel combustion sources was enhanced beginning with the 1999 National Emissions Inventory. Prior to 1999, the emissions measurement data methodology only included the filterable portion (which means the solid particle matter at elevated stack temperatures). Beginning with the 1999 NEI, both the filterable…
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