该研究表明，这种未受现行的保护臭氧层法规管制的气体，现在是人类活动所产生的破坏最大的臭氧层破坏物质。

The gas, which is not covered by existing regulations to protect ozone, is now the largest ozone-depleting substance produced by human activity, the research shows.

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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.

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而当阳光照射在这些物质上时就会产生臭氧。

And when sunlight hits those compounds, ozone forms.

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