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Regional Haze SIP Template: Mobile Sources Edie Chang California Air Resources Board WESTAR Fall Technical Conference September 2002
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Mobile Sources 308 v. 309 308: States/Tribes should consider “all anthropogenic sources of visibility impairment,” including mobile sources, in long-term strategy 309: –States/Tribes must determine whether mobile source emissions “significantly” impact visibility in Class I areas; if “yes” State/Tribe must limit mobile source emissions of VOC, SO 2, NOx, EC, OC & PM2.5 to their lowest levels between 2003 & 2018 State/Tribe must develop a tracking system to report annual mobile source emissions –States/Tribes must update EPA on status of adopted regional and local strategies recommended by GCVTC
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WRAP Mobile Source Activities Emission Inventory –Improve road dust activity factors (moved to R&D) –Develop mobile source inventories for WRAP-neighbors Definition of “Significance” –WRAP considering three possible definitions; decision pending modeling runs Controls –Status report on regional & local mobile source controls –Guidance for emission reductions from existing nonroad mobile sources –Smart growth toolkit and workshop Tracking –Developing web-based tracking system
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Are Your Mobile Sources Significant? MSF Preliminary Recommendation Considers on- & off-road engine emissions, evaporative emissions, and tire & brake wear Three alternatives: –Cumulative impact from all 9 states –Individual area alternative #1 Must show 1 dV of impact to be significant –Individual area alternative #2 Must show 0.1 dV of impact to be significant Evaluate three alternatives using modeling for reasonableness Final recommendation expected by end of summer
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Cumulative Impact Alternative WRAP would assess cumulative impact of mobile sources in 9-state transport region on parks –If cumulative impact is < 1 dV, than any area responsible for 0.5 dV is deemed “significant” –If cumulative impact is > 1 dV, than any area responsible for 0.1 dV is deemed “significant” MSF anticipates cumulative impact > 1 dV –Unclear if any 309 areas will be > 0.1 dV
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Regional Haze SIP Template Updates Needed Current status of emission inventory Current status of tracking system Significance -- definition and results of analysis Status of regional and local strategies recommended by the GCVTC
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