Milw 16th St, Wisconsin PM2.5 (fine particulate matter) AQI is 9 - Milw 16th St, Wisconsin PM10 (respirable particulate matter) AQI is 12 - Milw 16th St, Wisconsin NO2 (nitrogen dioxide) AQI is 8 - Milw 16th St, Wisconsin SO2 (sulfur dioxide) AQI is 2 - Milw 16th St, Wisconsin O3 (ozone) AQI is 20 - Milw 16th St, Wisconsin CO (carbon monoxide) AQI is 5 -