smog

2 definitions • 4 examples

a mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health:

Smog is a major problem in Athens.

As we flew into the airport, we could see a murky yellow smog hovering over the city.

air pollution caused by smoke or chemicals mixing with fog:

[ U ] We get a lot of smog downtown.

[ C ] A poisonous smog killed 20 people.