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