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Observations

Observations. Ozone Drops for All Days, All Sites Ozone Control Program Less Effective on Weekends in SoCAB and SFBAAB No Weekend Effect in Sacramento PM Higher on Weekdays. Cause and Effect Hypotheses. “NO X Disbenefit” less truck traffic on weekend less NO X and soot

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Observations

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  1. Observations • Ozone Drops for All Days, All Sites • Ozone Control Program Less Effective on Weekends in SoCAB and SFBAAB • No Weekend Effect in Sacramento • PM Higher on Weekdays

  2. Cause and Effect Hypotheses • “NOX Disbenefit” • less truck traffic on weekend • less NOX and soot • “NOX Limitation” • similar VMT (but later on weekends) • more ozone production from NOX • “Overnight Carryover” • Friday and Saturday night traffic • “Increased Weekend Emissions” • diurnals,home,recreation

  3. Diurnal Evaporatives SUVs Friday Gasoline Power Generation House Painting Home Solvents Lawn and Garden Biogenic VOC Motorcycles Boats and Jet Skis Private Airplanes Barbecues Fast Food Preparation “Increased Weekend Emissions”

  4. Cause and Effect Research • Complementary Approaches • data analysis • emission activity and inventories • air quality modeling • Analyze Existing Data by 2000 AQMP • primarily data analysis • SoCAB has most available data • Analyze New Data by 2003 SIPs • primarily EI and modeling

  5. Air Quality Data Analysis Research • Characterize WE Effect • ozone, high ozone, PM, trends • Diurnal Profiles • ozone, NOX, CO, HC, PM • Traffic Activity Patterns • Overnight Carryover • surface, elevated, aloft • HC Speciation by Day of Week • Final Report

  6. Emission Inventory Needs • Monday to Thursday Similar • Friday, Saturday, Sunday • Source Information • truck traffic on weekends • diurnals,home,recreation • Temporal Information • Friday and Saturday night traffic • weekend VMT later in day • Spatial Information • weekend VMT further downwind

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