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Emissions Inventory Emissions Inventory Overview–Part 2Overview–Part 2

Melinda Ronca-Battista, ITEP

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Quantifying EmissionsEmission Factor

◦ Conversion factor provided by EPA (AP-42) or other source to quantify emissions

◦ E.g., lbs mercury emitted per ton of coal burnedActivity

◦ Collected by YOU◦ Process data (tons of coal burned, hours of

operation)◦ Control measures (efficiency/presence of

control equipment or procedures) Estimates Emission rate for a single

pollutant◦ E.g., 10 pounds/year mercury from small power

plant

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Quantifying (cont.)Basic estimating equation

E = EF x A

Control efficiency equation E = A x EF X (1-ER/100)

Where◦ E = Emissions rate (TEISS calculates)◦ EF = Emission factor (TEISS provides)◦ A = Activity (You collect and enter into TEISS)◦ ER = overall emission reduction efficiency

(%) Emission reduction (ER) efficiency not as important

in simpler calculations

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Where do I get activity data?Process activity

◦Directly from source◦From permits◦Monitoring/CEMs◦Questionnaires/Surveys

Control efficiency◦Engineering estimates◦From permits

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Point Sources–Data ElementsLocation (address, lat/long)Stack parameters

◦Height◦Diameter◦Flowrate◦Exit gas temperature

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Point Sources–Data Elements (cont.)

Process-level information◦Flow diagram◦Materials being consumed (type and

amount)◦Sub-processes involved◦Boiler throughput◦Operating schedules◦Control devices/efficiencies

See the AERR for details

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Point Source Data for TEISSLocation (address, lat/long)Facility/Site Name Release Points Emission Unit

◦Processes Control Equipment? Period (Time Frame) Emissions

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Nonpoint Source DataLocation (your reservation)Process information Control equipment/measures

◦Period (time frame) Emissions

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Nonpoint Source Data ElementsProcess information

◦Types of operations Gasoline storage tank refilling Unpaved roads

◦Emissions (e.g. VOCs, PM)◦“Activity data” needed to calculate

emissions Type of refilling process (splash or submerged) VMT, vehicle weight, speed, silt content, etc.

◦Pollution-management practices or control measures Dust abatement with water or petro-based

chemical

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Mobile Source Data ElementsVehicle Miles Traveled (VMT)Road surface typesVehicle types & useOff-road sources & use

◦ Engine types, hours of use, season, etc.Mobile source data or emissions

factors will typically come from other sources (DOT, air district, etc.)

Adjust data according to your reservation (“top-down approach”)

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Mobile Source DataOn-Road and Non-Road

◦Location (your reservation) Processes

Period Emissions

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Fire DataSpecial Case: covers large area,

like nonpoint sources, but in defined location like point sources

New EPA format and TEISS 2.0 treat fires as EVENTS

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In Summary, a Final EI is…A list of air pollution sources

◦For a defined area (reservation)◦For a defined time period (e.g., a year)

Information about each source (address, activities/processes occurring at a facility)

Estimate of emission rate for each source

Information on how you determined sources and emissions estimates

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An EI can also contain…Charts/graphs to display and

summarize quantitative dataMapsBackground information or other

information about your area related to emissions/sources

Copies of surveys, calculations used, references, etc.