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 Harborcraft

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
• Harborcraft

6
Adopted Regulations not reflected in OFFROAD

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

7
Base Year Data

• By equipment type, fuel type and HP bin
• Population and Activity
• Average Horsepower
• Load factor
• Flags Commercial/Residential, Non/Preempt,
  Non/Handheld, Non/Portable

8
Fuel Types Horsepower Bins

• Gas 4-stroke, Gas 2-stroke, CNG/LPG, Diesel
• HP cut points 2, 5, 15, 25, 50, 120, 175, 250,
  500, 750, 1000, 1000

9
Process Rate Distributions

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

• Activity
• Horsepower by model year
• Activity by age
• Temporal Operations
• Monthly/Season
• Daily
• Hourly

10
Forecasting/Backcasting

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

• Survival Rates
• By equipment type, fuel type and HP bin

11
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

12
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
• California Emission Forecasting System (CEFS)
  /California Emission Inventory Development and
  Reporting System (CEIDARS)

13
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

14
Additional changes

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

15

• Comparison to Almanac 2006

16
California ROG Emissions OFFROAD Model
Categories
50.6
73.0
111.3
17
California NOx Emissions OFFROAD Model
Categories
13.3
18.2
6.2
18
California PM Emissions OFFROAD Model Categories
-6.8
-4.1
-7.4
19
Sacramento Valley Air Basin ROG Emissions
OFFROAD Model Categories
45.0
62.4
100.8
20
Sacramento Valley Air Basin NOx Emissions
OFFROAD Model Categories
5.8
7.6
3.3
21
Sacramento Valley Air Basin PM Emissions
OFFROAD Model Categories
-7.4
-13.6
3.1
22
OFFROAD ContactsManager David Chou
cchou_at_arb.ca.gov [phone]