Pollutants and climatic conditions related to the formation of photochemical oxidants

Solar radiation produces harmful compounds such as atmospheric oxidants and pharmaceutical intermediates through photochemical reactions. To clarify the variables related to formation of oxidants, hourly data air pollutants climatic conditions in Tokyo region Japan from late May early June 2020 were analyzed. Air pollutants, NO, NO2, CO, SO2, NMHCs CH4, significantly lower than those 2019. It seems indicate that Japan's economic activity was suppressed by COVID-19 emergency. Photochemical NO higher during day at night. shows reaction is progressing day. Stepwise linear regression analysis revealed relative humidity, ambient temperature, wind speed (non-methane hydrocarbons) significant independent for formation.