Temporal and spatial distribution characteristics of ozone in Beijing

Ozone concentrations obtained from 35 automatic air monitoring stations in Beijing were analyzed to investigate their temporal and spatial distribution characteristics. A process with high ozone concentration in summer was analyzed. The results showed that ozone maintained relatively high concentration from May to August while in other months,the ozone concentration was at a low level. Overall,the average concentrations of ozone in different stations in a descending order were comparison and regional station,suburban environment evaluation station,urban environmental assessment station and traffic pollution monitoring station. Ozone diurnal variation showed a single peak distribution,the peak of which appeared at 15: 00 or 16: 00. Ozone concentration showed obvious weekend effect,which meant ozone concentration in daytime of weekend was higher than that in weekday. Ozone concentration was lower in urban Beijing,higher in surrounding counties and the highest in northeast area with more vegetation. A high ozone concentration process occurred in Beijing on June 3,2013. Under the effect of southwest wind in the afternoon,the concentration peaks of ozone in Yufa,Fengtaihuayuan,Olympic center and Huairou station occurred in order from south to north. Concentration peak of ozone in Huairou station occurred at 20: 00 in the night. It could be concluded that significant ozone transmission characteristic was reflected in this process.