1.

Photochemical smog formed in congested metropolitan cities mainly consists of

Answer»

HYDROCARBONS, `SO_2` and `CO_2`
Smoke , PEROXYACETYL nitrate and `SO_2`
Ozone , peroxyacetyl nitrate and `NO_x`
Hydrocarbons , ozone and `SO_x`

ANSWER :B


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