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SO2 pollutes because it is oxidized to SO3 that combines with water in the atmosphere to produce H2SO4 (sulphuric acid) which is one of the two acids responsible of the acid rain (the oxidant agent is O2 and the initializer is a hydroxyl radical HO·).

methane, CH4, is also oxidized in the atmosphere (the oxidant is also O2 and the initializer is also a hydroxyl radical HO·). After several years (up to 10) it is converted in CO2 (a greenhouse gas) and, even worse, during the oxidation process it produces different contaminants as ozone (O3), hydrogen peroxide (H2O2) that give rise to the so-called photochemical smog (which is not the same as the nowadays disappeared London smog).

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Q: How does sulphur dioxide and methane pollute the air?
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