AQI Reading Update 17 May 2019 Average PM2.5 reading in San Building, Year 2 Classroom Average PM2.5 reading in SanBuilding, Year 2 Classroom Beijing outdoor AQI reading at 8am: 172. Data collected from US Embassy. Categories Homepage Featured Article Discover more Homepage Featured Article AQI Reading Update 05 December 2019 Average PM2.5 reading in San Building, Year 3 Classroom. AQI Reading Update 28 November 2019 Average PM2.5 reading in San Building, Year 4 Classroom. AQI Reading Update 21 November 2019 Average PM2.5 reading in San Building, Year 1 Classroom. AQI Reading Update 15 November 2019 Average PM2.5 reading in San Building, Year 2 Classroom.