Search Frequent Questions
Filter By:
- Air Emissions Inventories Total results: 32
- Asbestos Total results: 141
- Coronavirus (COVID-19) Total results: 125
- Emergency Planning and Community Right-to-Know Total results: 303
- Fuel Program Total results: 804
- Lead Total results: 351
- MOVES Total results: 56
- Norwood Landfill Site Total results: 30
- Oil Regulations Total results: 107
- Radiation Total results: 120
- RadNet Total results: 33
- Risk Management Program (RMP) Total results: 286
Displaying 1 - 5 of 5 results
-
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 and
- Last published:
-
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.
- Last published:
-
Products authorized for use on oil discharges
Does EPA maintain a list of products that are authorized for use on oil discharges? If so, how can a manufacturer have their product included on the list? Section 311(d)(2)(G) of the Clean Water Act (CWA) directs EPA to prepare a schedule of dispersants, other chemicals, and oil spill mitigating
- Last published:
-
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 (NEI). Prior to 1999, the PM estimates for stationary fuel combustion sources were only including the filterable portion of the PM (the solid particle matter at
- Last published:
-
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 not
- Last published: