B2nounenvironmenturban
US/smɑːɡ/
UK/smɒɡ/
thick, dirty air that hangs over a city, caused mainly by traffic and factory smoke
In context
Heavy smog covered the city for three days, and many people stayed indoors.
Traffic is the main cause of smog in most big cities.
Schools were closed because of the thick smog this morning.
Words that go with smog
adjective + noun
- thick smogThick smog made it hard to see across the street.
- heavy smogHeavy smog hung over the valley all week.
noun + noun
- smog alertA smog alert was issued for the capital.
verb + noun
- cause smogExhaust fumes and factory smoke cause smog.
- reduce smogBanning old cars could help reduce smog.
noun + preposition
- cloud of smogA cloud of smog covered the skyline.
Common mistakes
Incorrect:
a smogCorrect: smog