Duncan Cairnsmore PM2.5 (fine particulate matter) AQI is n/a - Duncan Cairnsmore PM10 (respirable particulate matter) AQI is n/a - Duncan Cairnsmore NO2 (nitrogen dioxide) AQI is n/a - Duncan Cairnsmore SO2 (sulfur dioxide) AQI is 0 - Duncan Cairnsmore O3 (ozone) AQI is n/a - Duncan Cairnsmore CO (carbon monoxide) AQI is n/a -