[Characteristic Study on the "Weekend Effect" of Atmospheric O in Northern Suburb of Nanjing].

The data of ozone (O) and its precursors (NO, CO, VOCs) observed at northern suburb of Nanjing from December 01, 2013 to November 30, 2014 were used to analyze the difference of pollutant concentrations on weekends and weekdays, and its causes. The results showed that there was an obvious "Weekend Effect" in northern suburb of Nanjing. The mass concentrations of O on weekdays were higher than those on weekends, whereas mass concentrations of its precursors were higher on the weekends; The average mass concentrations of O were 19.84 μg·m, 53.45 μg·m, 57.17 μg·m, and 40.43 μg·m in winter, spring, summer, and autumn respectively. Compared with other seasons, "Weekend Effect " was more distinct in spring. The value of NO/NO was 4.81% higher on weekdays (3.63) than on weekends (3.46). The longer cumulative time and higher accumulation rate of O, and the stronger atmospheric oxidation capacity on weekdays were responsible for the higher O mass concentrations on weekdays. The correlation coefficients of the mass concentrations of O with VOCs, NO, NO, and NO were higher on weekdays than on weekends.