汽车尾气是城市空气污染的重要贡献者。

Car exhaust ___fumes are a significant contributor to air pollution in cities.

工业过程经常释放需要适当通风的危险烟雾。

Industrial processes often release dangerous ___fumes that require proper ventilation.

工作场所接触化学烟雾可能导致严重的健康问题。

Exposure to chemical ___fumes in the workplace can lead to serious health issues.