| Ozone – O3 |
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| • | Secondary
pollutant, formed via photochemical |
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| reactions
in the atmosphere from NOx and |
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| VOC
in the presence of sunlight |
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| • | Strong
oxidant that damages cells lining the |
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| respiratory
system |
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| • | Concentrations
often highest downwind of |
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| source
regions |
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| • | Emissions
reductions by control of NOx and |
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| VOC
emissions, especially from motor vehicles |
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