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Improving Agricultural PM 10 Emission Estimates in California. Dale Shimp California Air Resources Board December 1, 1997. dshimp@arb.ca.gov 916-324-7156. Emission Inventory. Comprehensive Estimates of Emissions from Air Pollution Sources Point, Area, and Mobile Sources

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improving agricultural pm 10 emission estimates in california
Improving Agricultural PM10Emission Estimates in California

Dale Shimp

California Air Resources Board

December 1, 1997

dshimp@arb.ca.gov

916-324-7156

emission inventory
Emission Inventory
  • Comprehensive Estimates of Emissions from Air Pollution Sources
  • Point, Area, and Mobile Sources
  • Based on Typical Local Conditions
  • ARB & District Cooperative Effort
  • Continual Improvements
estimation of emissions
Estimation of Emissions
  • Emission Factor (EF)
    • Emissions per unit of activity (i.e., lbs/PM10 per acre tilled)
  • Activity Data (Process Rate, PR)
    • Vehicle Miles Traveled, Acre-Passes
  • Emissions
    • Emissions = EF x PR
particulate matter is
Particulate Matter Is...
  • Sand and Soil
    • Geologic material, dust, dirt
  • Soot
    • Combustion products, wood smoke, diesel exhaust
  • Secondary Particles
    • Formed via reactions in atmosphere of gaseous pollutants
particulate categories
Particulate Categories
  • TSP - Total Suspended Particulate
    • PM30: particles 30 microns of less in size; mainly composed of geologic material
  • PM10 - particles 10 microns or less
    • Can be dominated by geologic dust particles or secondary particles
  • PM2.5 - particles 2.5 microns or less
    • Typically combustion products & secondary PM
agricultural pm 10 sources of interest
Agricultural PM10 Sourcesof Interest
  • Field/Orchard Operations
  • Wind Blown Dust
  • Farm Equipment Exhaust
  • Livestock Waste
current agricultural emissions inventory
Current Agricultural Emissions Inventory
  • Land Preparation for All Crops
  • Almond/Walnut Harvesting
  • Cotton Harvesting
  • Agricultural Lands Windblown Dust
  • Farm Equipment Exhaust
  • Cattle Feedlot Dust
land preparation
Land Preparation
  • Acreage Data from California Department of Food and Agriculture
  • Cultivational Practices from Farmers
  • Emission Factors from AP-42 (U.S. EPA)
  • NRCS Soil Silt Data
harvesting
Harvesting
  • Acreage Data from California Department of Food and Agriculture
  • Cultivational Practices from Farmers
  • Emission Factors from UC Davis
wind blown dust
Wind Blown Dust
  • Land Use Data from Department of Water Resources
  • Soils Data from Natural Resources Conservation Service
  • Incorporated Crop Canopy and Irrigation Effects
  • ARB Estimation Methodology Adapted from USDA Soil Erosion Equation
agricultural pm 10 and the overall pm 10 inventory
Agricultural PM10 and the Overall PM10 Inventory
  • Annual Emissions Deceptive
  • Farm Operations High in the Fall
  • Windblown Dust High in the Spring
planned inventory improvements
Planned Inventory Improvements
  • Crop and Equipment Specific Emission Factors
  • Additional Harvest Emissions
  • Livestock Emissions (Ammonia & Dust)
  • Further Use of GIS Based Estimates
pm 10 emission changes
PM10 Emission Changes

TSD-phg/5-27-97

agricultural pm 10 meetings
Agricultural PM10 Meetings
  • Work with Farm Industry Representatives
  • Identify Crops to be Updated
  • Meet With Growers of Identified Crops
  • Complete Crop Calendars for All Major SJV Crops
pm 10 emission changes20
PM10 Emission Changes

1106 tpd PM10

430 tpd PM10

TSD-phg/5-27-97