Relationship between Changes over Time in Factors, Including the Impact of Meteorology on Photochemical Oxidant Concentration and Causative Atmospheric Pollutants in Kawasaki

To clarify the relationship between changes in photochemical oxidants’ (Ox) concentrations and their precursors Kawasaki, a series of analyses were conducted using data on Ox, precursors, nitrogen oxides (NOx) volatile organic compounds (VOCs), meteorology that had been monitored throughout city Kawasaki for 30 years from 1990 to 2019. The trend air temperature was upward, wind speed downward, solar radiation indicating an increasing meteorological factors which Ox tend be higher. Between 2013, annual average increased remained flat after that. three-year moving daily peak until 2015, that, it exhibited slight decline. amount generated is another important indicator. evaluate this, new indicator, daytime production oxidant (DPOx), proposed. DPOx defined by averaged less previous day’s nighttime concentrations. April October has decreasing since around 2006, found this indicator reflects impact reducing emissions NOx VOCs Kawasaki.