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Improving Agricultural PM 10 Emission Estimates in California

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

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  1. Improving Agricultural PM10Emission Estimates in California Dale Shimp California Air Resources Board December 1, 1997 dshimp@arb.ca.gov 916-324-7156

  2. 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

  3. 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

  4. 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

  5. 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

  6. PM10 Emission Sources for SJV

  7. Agricultural PM10 Sourcesof Interest • Field/Orchard Operations • Wind Blown Dust • Farm Equipment Exhaust • Livestock Waste

  8. Current Agricultural Emissions Inventory • Land Preparation for All Crops • Almond/Walnut Harvesting • Cotton Harvesting • Agricultural Lands Windblown Dust • Farm Equipment Exhaust • Cattle Feedlot Dust

  9. 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

  10. Harvesting • Acreage Data from California Department of Food and Agriculture • Cultivational Practices from Farmers • Emission Factors from UC Davis

  11. 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

  12. Agricultural PM10 and the Overall PM10 Inventory • Annual Emissions Deceptive • Farm Operations High in the Fall • Windblown Dust High in the Spring

  13. Monthly SJV PM10

  14. Planned Inventory Improvements • Crop and Equipment Specific Emission Factors • Additional Harvest Emissions • Livestock Emissions (Ammonia & Dust) • Further Use of GIS Based Estimates

  15. PM10 Emission Changes TSD-phg/5-27-97

  16. Crop Calendar for Cotton

  17. Seasonal Activity Profile

  18. 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

  19. PM10 Emissions Sources for SJV

  20. PM10 Emission Changes 1106 tpd PM10 430 tpd PM10 TSD-phg/5-27-97

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