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Proposed Control Measure to Reduce Emissions from Small Off-Road Engines ( SORE )

Learn about SORE emissions inventory updates, impact assessments, and proposed control measures to reduce emissions. Find detailed data sources and proposed strategies. Visit website for more information.

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Proposed Control Measure to Reduce Emissions from Small Off-Road Engines ( SORE )

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  1. Proposed Control Measure to Reduce Emissions from Small Off-Road Engines (SORE) Mobile Source Control Division July 2, 2003 Planning and Technical Support Division Public Workshop Monitoring and Laboratory Division California Air Resources Board

  2. Overview of Emission Inventory Update • Update SORE exhaust inventory • Update lawn and garden (L&G) population and activity estimates • Impact of updates • Addition of SORE evaporative emission inventory California Air Resources Board

  3. Data Source • Estimates of population and activity last updated in 1998 • New estimates based upon usage and population survey conducted by the ARB California Air Resources Board

  4. Lawn and Garden Survey • Grant from US EPA to obtain usage and population estimates of L&G equipment • 1000 surveys/month for 15 months • Randomly selected households from three broad regions of the state (Northern, Southern, and Central California) California Air Resources Board

  5. Survey Questionnaire • Type of dwelling • Information about equipment owned (such as equipment type,number and fuel type) California Air Resources Board

  6. Survey Responses • 2169 completed residential surveys • Response rate of 14% • Majority were single family dwellings (74%) • Equipment fuel type : 61% Gas 39% Electric, 12% Diesel California Air Resources Board

  7. New Population Estimates • Based on US Census 2000 data, California household = 11,502,870 • Expanded survey results to obtain gasoline equipment population • New estimate of 11.6 million pieces of residential, gasoline powered L&G equipment compared to current estimate of 4.5 million units • 1 piece of equipment per household California Air Resources Board

  8. New Activity Estimate • Subset of survey respondents participated in usage study • 224 event loggers were installed on various equipment for approx. 2 weeks • Event logger provided date and time stamp data of the equipment used • Annual activity estimates were revised based on this data California Air Resources Board

  9. Impact on SORE Exhaust Emission InventoryResidential plus Commercial L&G EquipmentYear 2000, Baseline, State California Air Resources Board

  10. More Information • For more detailed information, go to website : http://www.arb.ca.gov/msprog/offroad/sore/sore.htm • Document : Off-Road Modeling Change Technical Memo - Change in Population and Activity Factors for Lawn and Garden Equipment California Air Resources Board

  11. Evaporative EmissionsDefinition • Hot Soak - occurs immediately after engine is turned off • Diurnal - occurs when ambient temperature rises • Resting Loss - occurs when ambient temperature declines (mainly permeation) • Running Loss - occurs while equipment is being operated California Air Resources Board

  12. Data Source • Emission factors from testing done at ARB and Automotive Testing Laboratory (ATL) • Use of SHED when equipment was tested • Episodic summertime temperature profile (65-105F) with 7 RVP fuel used for baseline diurnal/resting loss testing California Air Resources Board

  13. Equipment Tested (Baseline) • Lawnmower 23 • Trimmer 8 • Leafblower 3 • Chainsaw 3 • Tractor 4 • Generator 4 • Tiller 1 California Air Resources Board

  14. Equations • Hot Soak (tpd) = Pop * Percent Usage * Emission Factor * RVP Correction • Diurnal/Resting = Pop * Emission Rate * Temp/RVP Correction • Running Loss = Pop * Percent Usage * Activity * Emission Rate * RVP Correction California Air Resources Board

  15. Emission Rate Definition • Emission Factor = zero hour rate + (deterioration rate)*(cumulative hours) • Zero hour is based on new engine test data • Deterioration rate is based on in-use engine test data California Air Resources Board

  16. Proposed Control Measure California Air Resources Board

  17. Example of Lawnmower Diurnal/RestingBaseline vs. Control Emission Factors California Air Resources Board

  18. Example of Lawnmower ExhaustBaseline vs. Control Emission Factors California Air Resources Board

  19. SORE Evaporative Emission InventoryYear 2020, State California Air Resources Board

  20. More Information • For more detailed information, go to website : http://www.arb.ca.gov/msprog/offroad/sore/sore.htm • Document : Off-Road Modeling Change Technical Memo - Addition of Evaporative Emissions for Small Off-Road Engines California Air Resources Board

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