They are formed byatmospheric photochemistry reaction, and could product OH radical, alkyl radical, ozone,carboxylic acid peroxyacetyl nitrates by atmospheric photochemistry reaction. 羰基化合物既是大气光化学反应的产物，又能通过光化学反应生成羧酸、羟基自由基、臭氧和过氧乙酰硝酸酯。
The function of hydrocarbons and nitrogen oxides in photochemical smog formation and the formative process of ozone and peroxyacetyl nitrate are discussed. 介绍了氮氧化物、碳氢化合物在形成光化学烟雾中的作用和臭氧、过氧乙酰硝酸酯产生的过程,并介绍了光化学烟雾的形成机理。