Abstract
The high concentration of NO 2 in the Tokyo Metropolitan area was investigated by means of air quality monitoring station data analysis and two numerical models: a photochemical box model and a photochemical grid model. Based on monitoring data, the typical variation with time of NO, NO 2 and O 3 for days with high NO 2 concentrations is presented. The application of the photochemical box and photochemical grid models successfully reproduced these variations when using typical emission intensities for NO x and NMHC from the Tokyo downtown area. Model results revealed that the high concentrations of NO 2 in winter (exceeding the Japan environmental quality standard) mainly result from photochemical oxidation of NO to NO 2.
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