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Spatial Pattern of US Criteria Pollutant Emissions:
EPA’s 1996 U.S. Emissions Data
Part 1: BackgroundData Manipulation Steps
Get, File, and Interpret Data Find data – EPA website – 3 relevant
files for criteria pollutants http://www.epa.gov/ttn/chief/net/index.html
MS Access (final size 2GB) Metadata – 1996 NATIONAL EMISSION
TRENDS (NET) PC INVENTORY FILE FORMAT Source Classification Code -
Divisions County Location
Field
Field Name
Type
Width
Dec
Description
1
FIPSST
Text
2
FIPS State Code
2
FIPSCNTY
Text
3
FIPS County Code
3
PLANTID
Text
15
NAPAP Plant ID Code
4
POINTID
Text
15
NAPAP Point ID Code
5
STACKID
Text
12
Stack Number
6
ORISID
Text
6
ORIS Plant ID (utility only)
7
BLRID
Text
6
Boiler ID Code (utility only)
8
SEGMENT
Text
2
Segment Number
9
PLANT
Text
40
Plant Name
10
SCC
Text
10
Source Classification Code
11
STKHGT
Number (Double)
4
0
Stack Height (ft)
12
STKDIAM
Number (Double)
6
2
Stack Diameter (ft)
13
STKTEMP
Number (Double)
4
0
Stack Temperature (F)
14
STKFLOW
Number (Double)
10
2
Flow Rate (ft^3/sec)
15
STKVEL
Number (Double)
9
2
Stack Gas Velocity (ft/sec)
16
BOILCAP
Number (Double)
8
2
Boiler Design Capacity (MMBtu/hr)
17
CAP_UNITS
Text
1
1996 NATIONAL EMISSION TRENDS (NET) PC INVENTORY FILE FORMAT
POINT
SOURCE
Example
etc.
Organizing Data Relationships
continually designing – build on queries
one-to-many Append Data Reduce Data Make Table
List of Queries (MS Access 2000)
List of Tables (MS Access 2000)
Reducing Data Sum Pollutant by County, SCC-
division First Group By:
location: [FIPSST] & [FIPSCNTY] Then Group By: SCC_DIV Take Sum: SO2_ANN
Make Table Query
ArcView Joined Data Tables with ArcView’s
County Files location code (connected to data) =
FIPS code (connected to ‘shape file’ or pictorial representation of county)
Mapped Pollutants (emission tons per unit area of county
Part 2: ResultsUnderstanding Spatial Variation
Maps Pollutants:
SO2, VOC, NOx, PM-10 Categories:
Total, Fuel Combustion, Industrial Processes, Transportation
Emission Unit: Annual Tons/Sq.Mile by County
SO2 Emissions
Fuel Combustion
83%
Industrial Processes
10%
Transportation7%
VOC Emissions
Fuel Combustion
5%
Industrial Processes
51%
Transportation44%
Nox EmissionsFuel
Combustion41%
Industrial Processes
7%
Transportation52%
Total Annual Emissions
Fuel Combustion
Industrial Processes
Transportation
Industrial Emission Summary identified major contributors to
criteria pollutants determined factors important in
emissions estimates showed spatial distribution of
pollutants based on source category
Future Analysis Connecting sources to US location
to develop a better “story” Compare 1980 spatial distribution
to 1996 – suggest CAUSALITIES Look at time trends for annual
emissions: comparison by source category, pollutant 1970-1998
SO2 Emissions - Time TrendFuel Combustion and Industrial Processes
0
5,000
10,000
15,000
20,000
25,000
0 2 4 6 8 10 12 14 16
Year
Emis
sion
s (th
ousa
nd s
hort
tons
)
Fuel Combustion Total
Industrial Processes Total