smog

By afternoon the smog had lifted.

Smog obscured our view.See Synonyms at block

We were prevented by heavy smog from seeing anything.

urban problems such as traffic congestion and smog; the philosophical problem of evil.See Usage Note at dilemma

The function of hydrocarbons and nitrogen oxides in photochemical smog formation and the formative process of ozone and peroxyacetyl nitrate are discussed.

Afterwards " fuliginous model " , " photochemical smog " after pollution, modern is being entered with " indoor air is polluted " the 3rd generation that is a mark pollutes period.