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Ozone good & bad

Learn about ozone distribution in the atmosphere, its role as a UV shield, and the impact of chemicals on stratospheric ozone. Discover its links to air pollution and climate change. Explore the significance of tropospheric ozone and greenhouse gas contributions.

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Ozone good & bad

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  1. Ozonegood & bad

  2. Ozone In the Atmosphere 100 60 Thermosphere 80 50 40 Mesosphere 60 Altitude (miles) 30 Altitude (km) 40 90% of ozone is in the stratosphere 20 20 10 10% of ozone is in the troposphere Troposphere 0 0 0 2 4 6 8 Ozone (parts per million)

  3. Ozone is the Earth’s natural sunscreen 100 60 Thermosphere 80 50 UVc - 100% Absorption Mesosphere UVb - 90% Absorption 40 UVa - 50% Absorption & Scattering 60 Altitude (miles) 30 Altitude (km) 40 20 20 10 Troposphere 0 0 0 2 4 6 8 Ozone (parts per million)

  4. Chemicals that Destroy Stratospheric Ozone • Cl is much more abundant than Br • Br is about 50 times more effective at O3 destruction From Ozone FAQ - see http://www.unep.org/ozone/faq.shtml

  5. October Average Ozone Hole Low Ozone High Ozone

  6. Tropospheric ozone links air pollution & climate change (1) primary constituent of smog in surface air [NRC, 1991] (2) 3rd most important greenhouse gas [IPCC, 2001] O3 greenhouse gas Free Troposphere hn NO NO2 Hemispheric Pollution OH HO2 Boundary layer (0-2.5 km) Direct Intercontinental Transport VOC, CH4, CO air pollution (smog) NOx NMVOCs O3 NOx NMVOCs O3 air pollution (smog) OCEAN CONTINENT 1 CONTINENT 2

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