WMO scientists assess and monitor air pollutants such as ground-level ozone,smog, particulate matter, sulfur dioxide and carbon monoxide.

VOA: standard.2009.03.23

She gave up presently as if a cloud had approached the sun or the smog thickened and so broken the religious instant, whatever it might have been.

现在她放弃了，就像乌云蔽日,烟雾笼罩,这个宗教瞬间也破碎了，不管它之前是这么样子。

耶鲁公开课 - 1945年后的美国小说课程节选

Smog hung all around the horizon.

烟雾在地平线上弥漫。

耶鲁公开课 - 1945年后的美国小说课程节选

While the mayor was away, city residents struggled with choking smog and extreme heat in well-insulated apartments built to withstand extreme cold.

VOA: standard.2010.08.10

And so, you make not only water vapor, NOX but you make some nitrous oxides, NOX, or nox as it is known, and this is the precursor to smog.

这样不仅仅得到的水蒸气，但是你会得到一些氮氧化物，或者如大家所知到的nox，这是烟雾的前驱体。

麻省理工公开课 - 固态化学导论课程节选

He says the farm helps ease Beijing's reliance on dirty energy that creates the capital's notorious smog.

VOA: standard.2010.08.03

Weather forecasters say that Moscow's smog may continue to recede on Wednesday.

VOA: standard.2010.08.10

Yet traveling back to smog-bound Beijing, past industrial factories, high-rise apartment blocks under construction,shopping malls and the ever growing number of cars, the future once more looks uncertain.

VOA: standard.2010.08.03