A Comparative Study on Air Pollution Characteristics in Four Key Cities during 2013 in Guangxi Province, China

Based on ambient air quality data of the four key cities (Nanning, Liuzhou, Guilin, and Beihai) in Guangxi, China, along with an analysis main emission sources, topographic features, weather conditions, backward trajectories, variation pollutants pollution episodes were studied. Results showed that was most serious Liuzhou followed by Nanning Beihai. PM2.5 dominant pollutant each city, O3, PM10, NO2. Concentrations SO2 CO did not exceed their National Ambient Air Quality Standard Grade II limit values. In cities, concentrations PM2.5, NO2, high during fall winter low spring summer, while O3 other seasons. summer seasons they Guilin these resulted mainly from stagnant accumulation characteristics regional pollution. However, levels durations for city different due to differences local geography, conditions. The influences masses similar. They influenced sources spring, autumn, long-distance transportation Hunan Hubei significant. winter, Beihai mostly affected south northeast Guangxi.