因此一般认为在秋冬季，大气中羰基化合物的来源主要是汽车尾气，而夏季则是汽车尾气和大气光化学反应。

Therefore, vehicular exhaust was the primary source in autumn and winter while both vehicular exhaust and photochemical reactions were the major sources in summer.

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模式除考虑污染物在大气中的输送、弥散过程外，还加入了光化学反应过程。

Except for considering the processes of transfer and diffusion of air pollution matter, the model covers the photochemical reaction effects as well.

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研究了1-硝基芘在模拟大气条件下的光化学反应。

Potoreaction of particle-bound 1-nitropyrene under simulated atmospheric condition has been studied.

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