In order to reveal the current air quality status in Liaoyang city and provide a basis for the future management,Liaoyang city was divided into four areas in this study including clean area,industrial area,traffic area and residential area based on its function.A monitoring site was established in each function area.Based on seasonal weather,a year was divided into spring,summer,autumn,and winter season.Also,the winter season was divided into heating period and non-heating period.In 2009,the air qualities i...