Springfield, Ohio PM2.5 (fine particulate matter) AQI is n/a - Springfield, Ohio PM10 (respirable particulate matter) AQI is n/a - Springfield, Ohio NO2 (nitrogen dioxide) AQI is n/a - Springfield, Ohio SO2 (sulfur dioxide) AQI is n/a - Springfield, Ohio O3 (ozone) AQI is 21 - Springfield, Ohio CO (carbon monoxide) AQI is n/a -