Unit Conversions and
EI Codes
Angelique Luedeker
ITEP/TAMS Center
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Unit Conversions and TEISS
TEISS does some of the math for
you
Emission Factor (EF) x Activity Data =
Emissions
TEISS provides EF
You provide activity data
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Activity Data Example
The Total Area Tilled value
you enter needs to be in
units of acres
If you have collected data in
other units, for example,
square miles, you need to
convert
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Emission Factors
EF is basically a conversion factor
Examples
Lbs of PM10 emitted/acre of area tilled
Lbs of PM2.5 emitted/vehicle mile traveled
Lbs of mercury emitted/ton of coal burned
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Unit Converter in TEISS
TEISS has unit conversion tool
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TEISS Unit Conversion Tool
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Area is selected, shows list of area units
TEISS Unit Conversion Tool
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Mass is selected, shows list of mass units
Energy Unit Conversion
Converting energy units often requires
knowing energy density of a given
material
Energy density can vary within the same
material
TEISS Unit Converter tool cannot
convert energy to other unit categories,
such as volume
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Energy Density
Examples
Natural gas from different sources provides
differing amounts of energy
High-heating value gas has 1027
BTUs/ft3
Low-heating value gas has 930 BTUs/ft3
Most gas is somewhere in-between
Different kinds of wood provide different
amounts of heat when burned
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Energy Density Defaults
What if you don’t know energy density of your
reservation’s natural gas or wood?
Use defaults
For natural gas, EPA’s AP-42 gives 1020
BTUs/ft3
For wood, TEISS provides a converter within the
wood-burning calculators
Allows you to enter volume of wood (cords) and specify
wood type
Then it calculates tons of wood per cord required to do
calculation
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CODES!!!
Why do we need them?
Computers organize information by codes
Standardize descriptions and categories
Examples
States – CO, Co, Colo., Colorado
A computer sees 08, the FIPS code for
Colorado
Takes guesswork out
One long code signifies a paragraph-long process
description
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FIPS Codes
FIPS - Federal Information Processing Standard
States, Counties, and Tribes
Example
Kansas FIPS code = 20 (2 digit)
Brown County FIPS code = 013 (3 digit)
Kickapoo FIPS code = 861 (3 digit)
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SCC - Source Classification Codes
Approximately 9,000 valid codes
Maintained / categorized by U.S. EPA
Source Classification
Point = 8 characters
Nonpoint, Non-Road, On-Road, Event and
Biogenic = 10 characters
EVERY PROCESS in TEISS must have an SCC!
Used as primary identifying data element in EPA's
National Emission Inventory (NEI)
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SCC for Point Sources
Example: 30200501
3-02-005-01 = 8-characters
For each SCC, there are four levels of descriptions
SCC 1 Description (3): Industrial Processes
SCC 3 Description (02): Food and Agriculture
SCC 6 Description (005): Feed and Grain
Terminal Elevators
SCC 8 Description (01): Shipping and
Receiving
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SCC for Nonpoint and Other
Sources
Example: 2610030000
26-10-030-000 = 10 characters
For each SCC, four levels of descriptions
SCC 2 Description (26): Waste Disposal,
Treatment, and Recovery
SCC 4 Description (26-10): Open Burning
SCC 7 Description (26-10-030): Residential
SCC 10 Description (26-10-030-000): Household
Waste
Only 1 of each SCC in a location (reservation)
because nonpoint SCC emissions are combined
(unless emission type is diff: evap, exhaust, refueling
are diff types of emissions from same SCC)
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SIC and NAICS Codes
SIC - Standard Industrial Classification
NAICS – North American Industry Classification
System
Economic sector codes
Beginning in 1997, SIC replaced by NAICS
NAICS reorganizes categories on
production/process-oriented basis
EVERY POINT SOURCE in TEISS must have a
NAICS Code!
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TEISS View –NAICS Codes – How
to Find Them
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Homework due in 5 days:
Answer the questions in the
UnitConversionExercise document.
There are two pages of questions
Use TEISS to determine SCCs of sources
in the Homework_EICodes document
Email your answers to both assignments
to the instructors
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