United States Pollutant Standards Index (PSI)
for Stockholm County urban area.

Air quality indicator PSI the latest 3 days
PSI scale:
Very unhealthful
Arrow_top United States short term National
Moderate Arrow_bot Ambient Air Quality Standards
Air quality indicator PSI the latest 3 days
The PSI is based on hourly urban background monitoring and is automatically updated on the www every hour. The hourly values are raw data.

PSI is used to report air quality over large urban areas not only in United States but all over the world. PSI values are derived from PM10, SO2, CO, O3 and NO2 concentrations. The pollutant with the highest index is used to describe the air quality every hour. In Stockholm urban area PM10 and O3 concentrations are the critical pollutants used when applying the PSI scale.

Stockholm Air Quality Indicators, last hour:
Map regionSO2NO2O3COPM 10PSI
 City centre:- - --
 Urban area: -
 Rural area:- ---

Klick on the rectangles above to see latest three days of data for each air quality indicator