Science & Technology
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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.
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Water Research on Per- and Polyfluoroalkyl Substances (PFAS)
Informational page on the current water-related PFAS research
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How Does Air Pollution Affect Plants and Ecosystems? Webinar
This EPA webinar will discuss air pollution research on trees, crops, and ecosystems, with a focus on ground-level ozone from the last several decades to the present.
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Household Energy Research Webinar Bibliography and Response to Questions
A bibloiography and response to questions from a webinar on Household Energy Research Progress and Future Directions is available.
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Science Matters Podcast: Climate Change Research
Listen to a podcast with Dr. Andy Miller, the Associate Director for Climate for the Agency's Air, Climate, and Energy Research Program, as he answers questions about climate change research, or read some of the highlights from the conversation here.
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Governance Charter of E-Enterprise for the Environment
Document presents the charter of the EELC
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Publications
Publications resources relating to EPA research.
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Methane Challenge Program Technical Documents
Methane Challenge Program Technical Document
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Assessing Perchlorate Occurrence in Ambient Waters Following the Usage of Fireworks Grant
EPA awarded $2,499,583 in research grant funding to Texas Tech University for research on perchlorate contamination after fireworks events near water sources.
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Drivers and Environmental Impacts of Energy Transitions in Underserved Communities Request for Applications (RFA)
This is an ACE/EJ RFA addressing environmental impacts in underserved communities
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Cumulative Health Impacts at the Intersection of Climate Change, Environmental Justice, and Vulnerable Populations/Lifestages: Community-Based Research for Solutions Request for Applications (RFA)
This is a request for applications to address climate change and EJ