NO 2 reacts with VOCs to produce O 3 , resulting in a decreasing trend at all three stations.
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Factors Influencing O<sub>3</sub> Concentration in Traffic and Urban Environments: A Case Study of Guangzhou City.
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The sentences
The NO 2 concentration shows an increasing trend from 04:00–8:00 at the two roadside stations (HS and JY) because of traffic emissions.