David Chou

1
Off-Road Mobile SourcesEmissions Inventory
Update

• David Chou
• Off-Road Modeling and Assessment Section

2
Overview

• OFFROAD model November 1 Release
• Summary of September Workshop
• Additional changes
• Comparison to Almanac 2006
• Closer Look
• Recreational Vehicles
• Pleasure Crafts
• Diesel Construction Equipment gt50hp
• Gas Cans
• Ocean-going Vessels and Harbor Crafts

3
OFFROAD Releasehttp//www.arb.ca.gov/msei/offroad
/offroad.htm

• OFFROAD Model
• Executable
• Datafiles
• Users Guide
• Documentation
• Tech memos
• One-pagers (Category specific briefs)
• Presentations
• Listserve

4
OFFROAD Model Equipment Categories

• Recreational Vehicle
• Construction and Mining
• Industrial
• Lawn and Garden
• Agricultural
• Commercial
• Logging
• Airport Ground Support

• Oil Drilling
• Military Tactical
• Dredging
• Other Portable
• Entertainment
• Railyard Operations
• Pleasure Craft
• Transport Refrigeration

5
Modules outside of OFFROAD Model

• Cargo Handling Equipment
• Locomotives
• Gas Can
• Ocean-going Vessels
• Harbor Craft

6
Adopted Regulations not reflected in OFFROAD

• TRU ATCM
• Portable Equipment ATCM
• Off-road Motorcycle Green/Red Sticker Program
• Carl Moyer Program

7
Equipment Type Subcategories

• Fuel Type Gas 4-stroke, Gas 2-stroke, CNG/LPG,
  Diesel
• HP Bins 2, 5, 15, 25, 50, 120, 175, 250, 500,
  750, 1000, 1000
• Flags Commercial/Residential, Non/Preempt,
  Non/Handheld, Non/Portable

8
Process Rate

• Population
• Base Year Population
• Subarea Allocation
• Age Distribution
• Seasonal Operating Fraction

• Activity
• Base Year
• Ave Annual Activity
• Ave Horsepower
• Load Factor
• Horsepower by model year
• Activity by age
• Temporal Operations
• Monthly/Season
• Daily
• Hourly

9
Forecasting/Backcasting

• Growth Factors
• CY1970-2040
• Growth profiles reflecting socioeconomic trends,
  census, DMV
• By equipment class, fuel type, HP group

• Survival Rates
• By equipment type, fuel type and HP bin
• Power Systems Research 1996

10
Emissions

• Exhaust
• TOG or ROG, CO, NOX, CO2, PM, SO2, N2O, CH4
• Evaporative
• Hot Soak, Diurnal, Resting Loss, Running Loss
• Toxics TOG and PM10 based calculation
• Acetaldehyde, Acrolein, Arsenic, Benzene,
  1,3-Butadiene, Cadmium, Chromium, Formaldehyde,
  Lead, Manganes, Mercury, Nickel, Styrene

11
Output Tables

• User Specified
• Calendar Year and Season
• County, air basin, engine type, HP category
• Equipment type by ASC (AIRS Source Code) or EIC
  (Emission Inventory Code)

• Reports
• Tab separated
• By model year option
• Exhaust, Evap, Toxics
• Official Emission Inventory California
  Emission Forecasting System (CEFS) /California
  Emission Inventory Development and Reporting
  System (CEIDARS)

12
Summary of September Workshop

• Updates
• Process Rate related
• Emission Factors
• Correction Factors and Adjustments
• Equipment Categories
• Locomotives
• Cargo Handling Equipment
• Gas Cans
• Ocean-Going Vessels
• Commercial Harborcraft

13
Additional changes

• Off-road Equipment
• Off-road Motorcycles/ATV/ Snowmobile
• Pleasure Craft
• Diesel Construction gt 50hp
• Gas Cans

14

• Comparison to Almanac 2006

15
California ROG Emissions OFFROAD Model
Categories
50.6
73.0
111.3
16
California NOx Emissions OFFROAD Model
Categories
13.3
18.2
6.2
17
California PM Emissions OFFROAD Model Categories
-6.8
-4.1
-7.4
18
San Joaquin Valley Air Basin ROG Emissions
OFFROAD Model Categories
58.2
76.6
112.3
19
San Joaquin Valley Air Basin NOx Emissions
OFFROAD Model Categories
17.4
20.1
6.3
20
San Joaquin Valley Air Basin PM Emissions
OFFROAD Model Categories
-1.5
-3.2
12.1
21
OFFROAD ContactsManager David Chou
cchou_at_arb.ca.gov [phone]