Smog is formed by

Options

A. smoke and fog
B. condensation of vapour
C. fog and `NO_2`
D. smoke and `CO_2`

Answer

A

Explanation

Somg is formed out of nitrogen oxides, sulphur oxides, ozone, smoke or particulates among others. Man made smog is formed due to coal emissions, vehicular emissions. It is formed by smoke and fog.