They are formed byatmospheric photochemistry reaction, and could product OH radical, alkyl radical, ozone,carboxylic acid peroxyacetyl nitrates by atmospheric photochemistry reaction.

羰基合物既是大气反的产物，又能通过反生、羟基自由基、臭氧和过氧乙酰硝酯。

The function of hydrocarbons and nitrogen oxides in photochemical smog formation and the formative process of ozone and peroxyacetyl nitrate are discussed.

介绍了氮氧物、碳氢合物在形烟雾中的作用和臭氧、过氧乙酰硝酯产生的过程,并介绍了烟雾的形机理。