《清洁空气法》授权美国环保局监管有害污染物，如微粒物质和臭氧。
The Clean Air Act mandates the EPA to regulate harmful pollutants such as particulate matter and ozone.
这些燃烧过程同样释放化学物质如甲烷、氮氧化合物、挥发性的有机化合物和一氧化碳在光照下反应形成臭氧。
These same processes also release chemicals that combine in sunlight to form ozone: methane, nitrogen oxides, volatile organic compounds, and carbon monoxide.
如 臭氧层变薄，其根源化学品被禁止。
When the ozone layer was thinning, chemicals causing it were banned.
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