另一个一氧化碳污染源在加拿大阿尔伯塔省，那儿正燃烧着熊熊大火。
A second source of carbon monoxide is Alberta, Canada, where large wildfires are burning.
一氧化碳也是产生臭氧污染和城市雾霭的化学物质之一。
Carbon monoxide is also one of the chemicals that create ozone pollution and urban smog.
汽车排放的尾气严重污染了达卡的空气，随着无铅汽油的出现略改善了空气的质量，但是有毒的一氧化碳气体依旧存在着。
Dacca's air is burdened by vehicleemissions; air quality improved after the advent of unleaded gasoline, but toxins such as carbon monoxide persist.
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