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Ozone is formed in part by nitrogen gas briefly holding on to a singlet oxygen, which later drops onto an oxygen molecule (usually involving low energy visible light). NOx can be converted to essentially nitric acid by the presence of water vapor. Addtionally, ozone is decayed by water vapor via the peroxide mechanism. So, "depression" is a reduction of ozone both by increased decay and decreased production. "Acidification" is conversion of NOx to some more stable versions that are unable to form ozone, but have the energy to stay as an acid.

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17y ago

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