PM2.5 Monitor (Thermo Scientific pDR-1500) reading shows the current (1-second instant reading) PM2.5 concentration is 1242 ug/m3, with time-weighted average (10-second average) showing as 1242 ug/m3. The monitor had been operated for 23 minutes, with the Relative Humidity Correction function enabled. Photo taken at 04:36 PM in Dongsibatiao, Beijing. 

PM2.5监测器（赛默飞世尔pDR-1500气溶胶颗粒物检测仪）读数显示目前（1秒瞬时读取）PM2.5浓度为1242μg/m3，时间加权平均浓度为（10秒平均）显示为1242μg/m3。该监测器已持续工作23分钟，开启了相对湿度校正功能。照片摄于下午4点36分，东四十条，北京。