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.
然后，当这些化学物质与氮氧化合物(存在于汽车排放的废气中)发生化学反应时，就会形成臭氧，这会对人类和动物的健康构成更大的威胁。
When the chemicals react with nitrogen oxide--found in pollution from cars--they form ozone, a much bigger health threat to humans and animals.
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