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。
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。
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。
Carbon monoxide is also one of the chemicals that create ozone pollution and urban smog.
一氧化碳也是产生臭氧污染和城市雾霭的化学物质之一。
WMO scientists assess and monitor air pollutants such as ground-level ozone, smog, particulate matter, sulfur dioxide and carbon monoxide.
世界气象组织的科学家对地面臭氧、烟雾、空气悬浮微粒子、二氧化硫、一氧化碳之类的污染物质进行评估监测。
As one important predecessor of photo-chemical smog and ozone, non-methane hydrocarbon's (NMHC) emission is paid great attention.
光化学烟雾和大气臭氧形成的重要前体物之一——非甲烷烃(NMHC)的排放受到研究者的热切关注。
He ordered the Environmental Protection Agency to shelve the plans to reduce concentrations of ozone from factories and power companies - one of the main contributors to smog.
他下令环保署暂时搁置降低工厂和发电站向空气中排放的臭氧的浓度的计划。臭氧是造成雾气的主要因素之一。
The pollutants often occur with high levels of other toxins such as lead, zinc, and ground-level ozone, a component of smog formed by chemical reactions between car exhausts and sunlight.
这些污染物常常与其他有害物质，如铅、锌和地面臭氧一起出现。地面臭氧是汽车排气与太阳光一起发生光化学反应形成的一种烟雾成分。
Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight.
光化学烟雾的臭氧和氮氧化物和碳氢化合物在阳光下产生的反应。
When combined with volatile organic compounds, NOx can create smog or ground-level ozone pollution in hot stagnant weather - causing respiratory problems in humans.
一旦与挥发性有机化合物结合，氮氧化合物就会在低压闷热天气造成烟雾或地面臭氧污染——导致人类呼吸系统问题。
When combined with volatile organic compounds, NOx can create smog or ground-level ozone pollution in hot stagnant weather - causing respiratory problems in humans.
一旦与挥发性有机化合物结合，氮氧化合物就会在低压闷热天气造成烟雾或地面臭氧污染——导致人类呼吸系统问题。
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