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INVESTIGATION OF ATMOSPHERIC OZONE IMPACTS OF SELECTED PESTICIDES

INVESTIGATION OF ATMOSPHERIC OZONE IMPACTS OF SELECTED PESTICIDES. Objectives Reduce uncertainties in O 3 impacts for pesticides in California Approach Conduct chamber experiments for  4 selected pesticide VOCs

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INVESTIGATION OF ATMOSPHERIC OZONE IMPACTS OF SELECTED PESTICIDES

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  1. INVESTIGATION OF ATMOSPHERIC OZONE IMPACTS OF SELECTED PESTICIDES Objectives • Reduce uncertainties in O3 impacts for pesticides in California Approach • Conduct chamber experiments for 4 selected pesticide VOCs • Develop mechanisms for pesticide compounds chosen for study, and estimate mechanisms for other pesticide compounds • Incorporate mechanisms into current or updated SAPRC mechanism and calculate atmospheric reactivities • Make recommendations on how to represent pesticide compounds in airshed models Status • Project approved. Should begin in June, 2005 Atmospheric Impacts of Coatings VOCs

  2. Volatile Compounds in Pesticide Profile in 2000 California VOC Emissions Inventory Atmospheric Impacts of Coatings VOCs

  3. Thiocarbamate Pesticides Molinate (3.3%) EPTC (0.5%) Pebulate (0.4%) Thiocarbamate Model Compounds(Studied by Kwok et al. 1992) Dimethylthiocarbamate Cycloate Atmospheric Impacts of Coatings VOCs

  4. Pesticide ProjectDiscussion • One-year project should begin in June • Priority of compounds to study will be determined in subsequent meetings with CARB staff and Pesticide stakeholder groups • Only compounds with sufficient volatility (greater than ~ 5 ppm) will be studied • Experimental approach will probably be similar to that used for Coatings reactivity study • Some pesticides will require use of SAPRC mechanism with chlorine chemistry (being developed under current contract) Atmospheric Impacts of Coatings VOCs

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