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.
无挥发性有机物质、不易燃；
挥发分：煤在限定条件下隔绝空气加热后，所得挥发性有机物质的产率。
Volatile: coal in a limited conditions after isolate air heating, which the production rate of volatile organics.
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