Abstract
The oxidation of nitric oxide (NO) to nitrogen dioxide (NO2), the initial step in formation of nitric acid, was analyzed based on atmospheric observations in urban central Osaka, Japan, focusing the relation with the behavior of photoreactive hydrocarbon (HC) species. Simultaneous observation at two vehicle exhaust monitoring stations, one has higher oxidation ratio of NO (NO2/NOx) and the other has lower NO2/NOx, in November 1998 and May 1999, had been held and investigated in current report. By using concentration ratios of reactive HCs to acetylene, obvious relation between NO2/NOx and HCs reaction was implied. In November observations, decline of aromatics to acetylene ratios with increasing NO2/NOx were observed at one station, while not appeared at the other station. Opposite tendencies were observed at the two sampling stations from November to May, implying complicated regional characteristics of photochemistries.
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