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Smog is the combination of sulphur dioxide and nitrogen dioxide
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now i am getting angry
with out reason you have answered
what reason?
so you plz answer
plz mark it for edit i will add some fro information

there will be no reaction takes place for those compounds.
when both are at same altitude and same temperature they will be look like fog.
read the meaning of smog in english dictionary
it is a mixture of smoke and fog
whose answer is correc
but i have read in news paper as like this