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Displaying 1 - 9 of 9 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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What is the purpose of a cellulosic biofuel waiver credit?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Under EISA, EPA is required to make cellulosic biofuel waiver credits available for years where we waive some portion of the statutory volume for cellulosic biofuel. These credits can then be used by obligated parties to comply with…
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Is fuel sold in U.S. territories, such as Puerto Rico, required to comply with RFS2?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . United States territories, such as Puerto Rico, are not included in the RFS2 program unless they opt-in according to §80.1443. See also §§80.1407(f) and 80.1426(b).
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Could you please expand upon the definition of the cellulosic biofuel waiver credit that may be for sale? I am not certain when, or if, a paper or pulp company could obtain a waiver credit or benefit from selling a waiver credit?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . Cellulosic biofuel waiver credits may only be purchased by obligated parties (e.g., gasoline and diesel fuel refiners and importers) from EPA. See section 80.1456(c).
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When renovating the exterior of a high-rise building, does the requirement to close and seal doors and windows within 20 feet of the renovation include closing those openings two-plus floors above the floor where work is to be performed?
Not necessarily. When establishing containment for an exterior renovation on a multi-story building, you must close all doors and windows within 20 feet of the renovation on the same floor as the renovation, and close all doors and windows on all floors below that are the same horizontal distance from…
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Is the Renewable Fuels Mandate in ethanol equivalent gallons?
See More Frequent Questions about Fuels Registration, Reporting, and Compliance Help . The percentage standards applicable under RFS are intended to be met with ethanol-equivalent volumes of renewable fuel. As a result, a gallon of ethanol counts as one gallon of renewable fuel for purposes of compliance with the four…
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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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