On the basis of the air quality daily report of Beijing Municipal Environmental Protection Bureau in 2006,it compared the PM10 affected days and PM10 concentration changes in Shijingshan and Beijing.

• 以2006年北京市环保局空气质量日报为依据,分析对比了北京市区与石景山区受可吸入颗粒物影响天数和可吸入颗粒物浓度变化情况。