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Weekend Effect Hypotheses on Air Resources Board Cal/EPA

Explore the Weekend Effect phenomenon with hypotheses on air pollution research. Investigate causes, coordinate research efforts, share results, and access information through the Cal/EPA webpage.

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Weekend Effect Hypotheses on Air Resources Board Cal/EPA

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  1. Weekend Effect Hypotheses Air Resources Board Cal/EPA Leon Dolislager Air Pollution Research Specialist Atmospheric Processes Section

  2. Weekend Effect

  3. WE Effect Working Group • Purpose • Investigation of cause(s) • Coordination of research • Sharing of results • Web Page - www.arb.ca.gov/ • aqd/weekendeffect/weekendeffect.html

  4. Weekend vs. Control Strategy

  5. Hypotheses of WE Effect • NOX-reduction • NOX-timing • Carryover near the ground • Carryover aloft • Increased weekend emissions • Decreased absorption of UV sunlight

  6. NOX-reduction

  7. NOX-reduction

  8. NOX-timing

  9. NOX-timing

  10. Carryover near ground

  11. Carryover aloft

  12. Increased WE emissions

  13. Decreased UV absorption

  14. Summary • Plausible • NOX-reduction - likely • NOX-timing - likely • Carryover aloft • Increased UV - unlikely • Carryover at ground - unlikely • Not Plausible • Increased emissions

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