Barr School, Ohio PM2.5 (fine particulate matter) AQI is 28 - Barr School, Ohio PM10 (respirable particulate matter) AQI is n/a - Barr School, Ohio NO2 (nitrogen dioxide) AQI is n/a - Barr School, Ohio SO2 (sulfur dioxide) AQI is n/a - Barr School, Ohio O3 (ozone) AQI is n/a - Barr School, Ohio CO (carbon monoxide) AQI is n/a -