Science & Technology
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December 21, 2005 EPA response to RFC: Approval of Air Credits and State Implementation Plan Amendments that Violate EPA's Data Quality Guidelines
EPA response to the Request for Correction (RFC)
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Outreach, Tools & Resources for Air Research
Outreach, tools & resources for EPA's Air Research portfolio including events, educational resources, publications, and research grants.
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May 26, 2005 RFC: Approval of Air Credits and State Implementation Plan Amendments that Violate EPA's Data Quality Guidelines
Submitted on behalf of the National Paint and Coatings Association and Sherwin-Williams
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Stakeholders Opposition to Denka’s Request for Reconsideration of EPA’s Toxicological Review of Chloroprene
Submittal by the Louisiana Environmental Action Network concerning a request for reconsideration.
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RFC 18001 – Anthraquinone – Supplemental Information
RFC 18001 – Anthraquinone – Supplemental Information demonstrating that National Toxicology Program Technical Report 494 should not be the basis for provisional screening values presented in Appendix A of “Provisional Peer-Reviewed Toxicity Values
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Data Governance Advisory Council
The Chief Data Officer at EPA established a Data Governance Advisory Council. This council of Data Officers will advise and support the CDO in creating ongoing frameworks.
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Related Emissions Factors Documents
On this page documents related to emissions factors developed by outside parties for EPA, but not extensively reviewed by EPA.
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EPA announces new website for Kentucky, Mississippi and Tennessee flood response efforts
The new website contains information, resources and guidance for residents impacted by recent flooding
EPA News Release: EPA announces new website for Kentucky, Mississippi and Tennessee flood response efforts
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Emissions Science Improvements: Emission Sectors
Plans for new and improved emissions approaches for the National Emissions Inventory.
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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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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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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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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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Emission Trends - FAQ
Emissions Trends frequently asked questions
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2020 National Emissions Inventory (NEI) Resources for State, Local, Tribal Agencies
Submittal and preparation documents for state, local, tribal agencies for all data categories of the 2020 National Emissions Inventory
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Emissions Science Improvements: Temporal and Spatial Allocations
Plans for new and improved temporal and spatial approaches for the National Emissions Inventory.
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Website Not Working - FAQ
Website Not Working FAQs
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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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POTW Nutrient Survey - Sample Questionnaire
POTW screener questionnaire
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Superfund Remedy Report
Collection of Superfund Remedy Reports which summarize remedy decisions over time.