Ground level ozone and particle pollution are the greatest threat to human health.
地表臭氧和颗粒污染物是人类健康的最大威胁。
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。
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。
Nitrous oxide is stable at ground level but breaks down in the upper atmosphere to form compounds that trigger chemical reactions that destroy ozone.
一氧化二氮在地平面时是稳定的，但在高层大气中则分解而形成某种化合物，从而引发化学反应而破坏臭氧层。
Apart from heatwaves, higher temperatures can increase ground-level ozone and hasten the onset of the pollen season, contributing to asthma attacks.
除了热浪，气温升高可增加地面的臭氧并使花粉季节提前开始，从而造成哮喘发作。
Unlike the protective layer of ozone in the upper atmosphere, excessive ground-level ozone is tied directly to health.
与高空中具有保护能力的臭氧层不同，过量的近地面臭氧直接危害人体健康。
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。
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。
Ozone is one of the major pollutants at the ground level, though a good gas in the stratosphere.
平流层臭氧有益，近地面臭氧是重要空气污染物。
He described it as an insidious gas; one that is not only an intense greenhouse gas but one that also helps create ground-level ozone, which is damaging to human health.
他描述甲烷为一种相当险恶的气体，它不仅是一种强烈的温室气体，而且会增加地面上的臭氧污染，危害人体健康。
He described it as an insidious gas; one that is not only an intense greenhouse gas but one that also helps create ground-level ozone, which is damaging to human health.
他描述甲烷为一种相当险恶的气体，它不仅是一种强烈的温室气体，而且会增加地面上的臭氧污染，危害人体健康。
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