In polluted urban areas, they also enhance production of ozone, a key ingredient of smog that is potentially toxic to animal and plant life.

在受污染的市区，他们还促进臭氧的产生，臭氧是对动物和植物生命有潜在毒性的烟雾的关键成分。

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Ozone is a major component of smog, and exposure to it has been linked with a greater risk of lung irritation, asthma, heart attacks and death.

臭氧是环境中烟雾的一个主要成分，与其长期接触就有引发肺病发炎、哮喘、心脏病和死亡的高风险。

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Ozone at ground level - not to be confused with the ozone layer in the upper atmosphere - is one of the major constituents of photochemical smog.

与高层大气臭氧层不同的是，地面的臭氧是光化学烟雾的一个主要组成部分。

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"It contributes to smog,acid rain, loss of biodiversity, dead zones along the coast, global warming, stratospheric ozone depletion.

VOA: special.2011.04.05

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

The largest problem is the dangerous amount of nitrogen oxide (which mixes with vehicle-exhaust gas to create ozone, and then smog) coughed out by the state's industrial plants.

ECONOMIST: The Lone Smog State

Mr. Obama personally said he would jettison the EPA rule that would have reduced smog-forming ozone levels.

WSJ: For Obama, Jobs Are a Focus for Regulations

In urban air ozone is a component of smog, which damages lungs.

FORBES: The Ozone Solution