Smestad, Oslo, Norway PM2.5 (fine particulate matter) AQI is 12 - Smestad, Oslo, Norway PM10 (respirable particulate matter) AQI is 5 - Smestad, Oslo, Norway NO2 (nitrogen dioxide) AQI is 3 - Smestad, Oslo, Norway SO2 (sulfur dioxide) AQI is n/a - Smestad, Oslo, Norway O3 (ozone) AQI is n/a - Smestad, Oslo, Norway CO (carbon monoxide) AQI is 0 -