ML071930129
| ML071930129 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 07/02/2007 |
| From: | Environmental Protection Agency |
| To: | Office of Nuclear Reactor Regulation |
| Wrona D J, NRR/DLR - 415-2292 | |
| Shared Package | |
| ML071920528 | List: |
| References | |
| Download: ML071930129 (4) | |
Text
UpA AirData - About the Emissions by Category Report - Criteria Air Pollutants Page I of 4 AirData
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Environmental Proteetion Agency EPA Home > Air & Radiation > AirData > Reports and Maps > select Geograly> Select Report/Map> About Emissions by Category Report - Criteria Air Pollutants Reports and Maps About the Emissions by Category Report - Criteria Monitor Data Air Pollutants About AirData How To Select. What does the report tell me?
Contacts
.The Emissions by Category report lists aggregate annual emissions of criteria air pollutants from sources in "tier-l" and "tier-2" categories defined by EPA. (These terms are defined later.) This report includes emissions from both point sources (facilities) and area sources (small businesses, residences, wildfires, vehicles, etc.). This is the only AirData report that gives total emissions of criteria air pollutants -- both point and area sources.
Area sources are not identified individually. Rather, their emissions are estimated in aggregate based on fuel used, miles driven, and so on. EPA computes aggregate emissions from area sources for each county, and (for this report) sums each county's point source emissions.
To get a better picture of what industries and activities are responsible for emissions, EPA defined 14 major types of sources (tier-I categories)and 84 subtypes (tier-2 categories).The most detailed Emissions by Category report lists aggregate area and point emissions for each tier-2 category for each county. You can create less detailed reports by omitting report columns, as described below in the How can I customize section. For example, you can produce reports that give total emissions by geographic area, with no breakdown by source categories.
The Emissions by Category report provides data for more years than other AirData emissions reports. EPA uses factors such as annual economic activity to estimate county aggregate emissions for years between emission inventories, which are compiled every three years. The Emissions by Category report gives you the capability to obtain year-to-year changes in aggregate emissions, compared with every-three-years data in the other AirData emissions reports.
Due to changes in EPA emission inventory procedures, 1999 emissions may not be directly comparable with prior years, especially with regard to particulate matter emissions.
What does the report look like?
The example report shows emissions of coarse particulate matter (PM 10, particles up to 10 micrometers in diameter) and sulfur dioxide (S02) in years 1998 and 1999. The report has the default level of summarization, which aggregates emissions by tier-1 category within each county. The grand total line gives total emissions for all categories and counties. in the report. The red down-arrow button in the PMIO point source emissions column indicates that values in that column determine the order of report rows, and they are in descending order.
http://www.epa.gov/air/data/help/hemcatrep.html 7/2/2007 7220
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How can I customize the report?
Sort Order You can use the SORT buttons 1 1A in each report column to change the order of rows in the report. The default sort order is ascending tier-1 category, ascending county, or ascending state, depending on which columns are included in the report.
Detail or Summary This is always a summary report; it always lists the aggregate emissions of similar sources. Omitting optional report columns can change the level of summarization in the report by grouping sources in different ways. The default report groups sources by tier-1 category within county; the report includes a row for each year and tier-1 category present in each county included in the report. The table below describes the types of summarization you may achieve by selecting various combinations of optional report columns. Note that if you select (include) the tier-2 report column, the tier-1 report column also is included.
Report Columns Selected (included) Emissions Summarized By...
Tier-i, Tier-2, Tier-2 category by year within county (most County*, State detailed).
Tier-i, County*, State Tier-1 category by year within county (default)
Tier-l, Tier-2, State Tier-2 category by year within state Tier-i, State Tier-1 category by year within state Tier-1 Tier-1 category totals by year for the entire geographic scope of the report (no breakdown by geography)
Tier-i, Tier-2 Tier-2 category totals by year for the entire geographic scope of the report (no breakdown by geography)
County*, State County totals by year (no breakdown by.
category)
State State totals by year (no breakdown by category)
(None) Not allowed
- Including either County or County Code report column (or both) has the same effect on data summarization.
Pollutant - Single or Multiple If you select a single pollutant, the report includes aggregate emissions of that one pollutant, and displays one pair of report columns for area- and http://www.epa.gov/air/data/help/hemcatrep.html 7/2/2007
EPA AirData - About the Emissions by Category Report - Criteria Air Pollutants Page 3 of 4 point-source emissions. If you select multiple pollutants, the report includes aggregate emissions of each of them, and displays multiple pairs of columns for each pollutant's area- and point-source emissions.
Year - Single or Multiple The report includes a row for every combination of geographic area, category, and year in which there were emissions. If you select a single year, the number of rows is the number of geographic areas and categories having emissions in that year. Ifyou select multiple years, there are (normally) multiple rows for each geographic area and category.
What do the report columns mean?
Row.#
Sequence number of report rows (lines). Sequence numbers are not associated with particular rows; they simply enumerate the rows of a report from first to last. Thus, choosing an alternate sort order for a report would change the sequence numbers associated with particular rows.
State Postal abbreviation for the state or territory in which a source is located. [ Details I County Name of the county (or equivalent jurisdiction) in which a source is located.
County Code Code for the county (or equivalent jurisdiction), in which a source is located, consisting of 2-digit FIPS state code and 3-digit FIPS county code. F/PS is the acronym for Federal Information Processing Standards, which defines codes used in most U.S. government information systems.
Tier 1 Name a major category of air pollution emission sources. There are 14 tier-1 categories, which group sources by type of industry or pollution-producing activity.
Tier 2 Name of a sub-category of air pollution emission sources. There are 84 tier-2 categories.
Year The calendar year in which pollutant emissions occurred. This column is displayed only when you select multiple years for the report. If you select a single year, it is shown in the report title.
Area Source Emissions The sum of all area source emissions, in short tons, in the geographic area and source category represented by a row of the report. (A short ton is 2000 pounds.)
Point Source Emissions The sum of all point source emissions, in short tons, in the geographic area and source category represented by a row of the report. (A short ton is 2000 pounds.)
Due to changes in EPA emission inventory procedures, 1999 emissions may not be directly comparable with prior years, especially with regard to particulate matter emissions.
http://www.epa.gov/air/data/help/hemcatrep.html 7/2/2007
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