Beijing PM2.5 (fine particulate matter) AQI is 191 - Beijing PM10 (respirable particulate matter) AQI is 125 - Beijing NO2 (nitrogen dioxide) AQI is 40 - Beijing SO2 (sulfur dioxide) AQI is 1 - Beijing O3 (ozone) AQI is 24 - Beijing CO (carbon monoxide) AQI is 10 -