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Click
here to view SITE MAP.
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The
purpose of this page is:
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- to provide an explanation of the presented databases;
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to serve as an errata page;
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to caveat reports and identify known problems; and
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to respond to frequently asked questions.
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Since
it takes time to identify, correct and update the databases and
Web pages, this page will serve as a notice to the user for the
entire web site. Since most of the Web pages are created
by a program and are not hand-written, it is difficult to include
reference to a correction or known problem on each page.
Problems will be corrected as soon as possible; however, if you
see an area of concern that has not been identified on this page,
please notify us via the Questions or
Comments
worksheet.
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Please
excuse our growth; these pages will change as improvements are
made. This site is not yet completely tested (a beta version),
so please provide suggestions for improvements.
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Select
from the list below to view topic specific information:
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-
Known Problems
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- 1996 National
Emission Trends Data (Version 400)
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- Clean Air Markets
Division's ETS/CEM Data and Utility Emissions
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- Air Quality
Data
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-
List of Nonattainment Areas
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- Maps
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Known
Problems
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Maine
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The locations of a few plants are incorrect. On the map,
they are located in the Atlantic Ocean. We are waiting for
information on the correct location of these sources.
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New
Hampshire -
The locations of a few plants are incorrect. On the map,
they are located in the Atlantic Ocean. We are waiting for
information on the correct location of these sources.
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Go to Top
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NET96
- 1996 National Emission Trends Data
(Version 400)
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The
NET database has recently been updated to Version 400. The
point source emissions of the following states were affected by
this update: Arkansas, Georgia, Louisiana, Michigan, Mississippi,
Michigan, New York, New Mexico, North Carolina, and Utah.
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Information
on the database used to create these pages:
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- Origin of NET
1996 Data by Major Sector
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- Emission Estimation
Methods That Have Changed Since the Last Report
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- Point and Area
Source Data Submitted
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These
Web pages were taken from the NET96 Version 400 as of May 2001.
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The
C/MSA summaries and reports/pages are presented because EPA recommends
that Metropolitan Statistical Area (MSA) or the Consolidated
Metropolitan Statistical Area (C/MSA) serve as the presumptive
boundary for 8-hour NAAQS nonattainment areas. On March 28, 2000
EPA issued the Boundary
Guidance on Air Quality Designations for the 8-Hour Ozone National
Ambient Air Quality Standards and a memorandum
on the 8-Hour
Designations
process
(the files are in PDF format).
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C/MSA
boundaries include entire counties except for some C/MSAs in New
England (Region I). Maps and Web pages are on a whole-county
basis. The detailed city and township boundaries were not
used since the emissions are on a county basis and the sources
are not identified by township. Also, the States are relatively
small, containing just a few counties, only one or two C/MSAs,
and one or two ozone 1-hour nonattainment areas. Since ozone
is seen over a large area, it did not seem necessary to present
detail below the county level. Some counties have two MSAs
within their boundaries. For example, York County, Maine
contains both the Boston C/MSA and Portland MSA.
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Clean
Air Markets Division's ETS/CEM Data and Utility Emissions
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The
Clean Air Markets Division's ETS/CEM and EIA-767 based emissions
at the state, boiler, and SCC level, may have different emissions
because the ETS/CEM data are most often measured data reported
to EPA, while the EIA-based data are calculated using EIA-767
reported fuel throughput and EPA's AP-42 emission factors.
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Air
Quality Data
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Some
ozone monitoring sites will almost always be out of date because
states and local agencies are constantly adding and moving various
sites. As a result, some monitoring sites that are on the
air quality data summaries will not be on the maps and some sites
on the maps may not have current air quality data.
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Top
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List
of Nonattainment Areas
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There
are no designated 8-hour ozone nonattainment areas at this time.
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Maps
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See
NET96
- 1996 National Emission Trends Data
(Version 400)
above.
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Go to Top
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Return
to Emission Home Page
Questions or Comments
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