noun
smog
SMAHG/smɑːɡ/
A haze of polluted air, often over a city.
Thick smog hangs over the city on hot, still days.
Etymology
Smoke and fog are packed into one word: the name captures polluted air as a mixture of burning fumes and obscuring mist.
In context
To ensure your car is not polluting more than it should, you often have to go through a mandatory smog check or emissions test to renew your registration.
More examples
- The mountains disappear behind a blanket of smog.
- Heavy smog makes breathing difficult for people with asthma.
- Cleaner cars help reduce smog in crowded cities.
Forms
smog
smoggy adjective — Filled with a haze of polluted air.