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Ozone production for VOCs at sampling sites. The individual ozone productions of 87 VOCs except toluene, 1-butene, m-,p-xylene, formaldehyde, acetaldehyde, ethylbenzene, and 1,2,4-trimethylbenzene were, respectively, low. Thus, for 87 VOCs, the total amount of each ozone production was indicated. At all sites, toluene had a high percentage of the ozone production
