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Mexico City

Mexico City. Sao Paulo. Singapore. Allepo, Syria. Bejing after rain. Bejing after sun. Photochemical smog. Primary pollutants. CO NO x VOCs (volatile organic compounds) Unburnt fuel Methane, PAHs. Secondary pollutants. Ozone PAN Organic oxidation products. Photochemical smog.

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Mexico City

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  1. Mexico City

  2. Sao Paulo

  3. Singapore

  4. Allepo, Syria

  5. Bejing after rain

  6. Bejing after sun

  7. Photochemical smog Primary pollutants • CO • NOx • VOCs (volatile organic compounds) • Unburnt fuel • Methane, PAHs Secondary pollutants • Ozone • PAN • Organic oxidation products

  8. Photochemical smog Wait…. How can you get ozone below the ozone layer? Answer: It is still O + O2 O3 But the O does not come from dissociating O2 The O comes from dissociating NO2 < 424 nm

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