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

If we believe environmental activist claims that carbon monoxide, nitrogen oxides, sulfur dioxide, mercury, and particulate emissions to say nothing of global warming and carbon dioxide emissions are so bad for human health, natural gas production should be a no-brainer.

FORBES: The Sierra Club Fails An Environmental Consistency Test

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