EMMA scale: Extreme WHO health protection limit for hour mean concentrations Severe Bad WHO health protection limit for 8 hour mean concentrations Very poor Poor Average Good
The indicator is based on hourly monitoring in main streets in the city centre and is automatically updated on the www every hour. The hourly values are raw data. The EMMA scale is proposed in the EC project EMMA as a common scale for air quality indicators. The limit between good and average air quality represents annual mean concentrations for main streets in Stockholm city centre.	Stockholm Air Quality Indicators, last hour: Map region NO2 O3 CO PM 10  City centre: - -  Urban area: -  Rural area: - - Klick on the rectangles above to see latest three days of data for each air quality indicator