Mannerheimintie, Helsinki PM2.5 (fine particulate matter) AQI is 17 - Mannerheimintie, Helsinki PM10 (respirable particulate matter) AQI is 5 - Mannerheimintie, Helsinki NO2 (nitrogen dioxide) AQI is 12 - Mannerheimintie, Helsinki SO2 (sulfur dioxide) AQI is n/a - Mannerheimintie, Helsinki O3 (ozone) AQI is n/a - Mannerheimintie, Helsinki CO (carbon monoxide) AQI is n/a -