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。

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The scientists also evaluated levels of ozone, nitric oxide, sulfur dioxide and carbon monoxide, but these showed a much weaker relationship.

科学家也评估臭氧、一氧化氮、二氧化硫和一氧化碳的水平，但是这些现实一种很弱的联系。

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In the birth stage of earth, the air was full of poisonous gases, such as gas of sulfur, carbon monoxide.

当地球初生之时，空气中充满着硫磺、一氧化碳等含毒气体。

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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

Fuel cells offer several advantages: they do not have moving parts and there is no burning involved, so there are negligible emissions of environmentally harmful gases like nitrogen, sulfur oxide and carbon monoxide.

FORBES: Magazine Article

For important pollutants monitored by the EPA, natural gas power cuts carbon monoxide emissions by 81%, nitrogen oxide emissions by 80%, sulfur dioxide emissions by 99%, mercury emissions by 100%, and particulates by 99%.

FORBES: The Sierra Club Fails An Environmental Consistency Test