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AIR POLLUTION

AIR POLLUTION. United States Primary Pollutants. Sources of Primary Pollutants. 9. U.S. National Air Quality Standards. Primary NAAQS: health of sensitive populations (e.g., asthmatics, children, elderly). Secondary NAAQS: public welfare protection (e.g., visibility,

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AIR POLLUTION

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  1. AIR POLLUTION

  2. United States Primary Pollutants

  3. Sources of Primary Pollutants 9

  4. U.S. National Air Quality Standards Primary NAAQS: health of sensitive populations (e.g., asthmatics, children, elderly) Secondary NAAQS: public welfare protection (e.g., visibility, damage to crops, vegetation, buildings, animals)

  5. Non-attainment Areas (2013) CO, SO2, NO2, O3, PM

  6. Los Angeles Air Pollution

  7. U.S. Emissions

  8. U.S. Emissions

  9. Wind Speed and Air Quality

  10. Diurnal Temperature Structure and Air Quality Afternoon— Unstable Pollutants disperse Pollutants from short stacks are trapped below inversion Night— Surface Inversion Stable

  11. Inversion is a “Lid” or “Cap”

  12. 0 Base of Inversion Mixing Layer

  13. inversion; light winds, horizontal spreading Early morning sfc. warming; rising air mixes pollutants toward surface Late morning unstable; rising and sinking motions Afternoon transition between stability conditions; diffusion, light winds Early evening inversion forming; some smoke above stack carried upward while inversion deepens Night

  14. Pollutants Concentrate in Valleys at Night

  15. Urban Heat Island

  16. 9

  17. Synoptic Weather and Air Quality

  18. Cold ocean current SOUTHERN CALIFORNIA H

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