"Air Quality" app
The federal and state measuring stations and the stations of the German Environment Agency take round-the-clock air quality measurements. Shortly after data is recorded, the results for a few of the pollutants and the resulting air quality index (AQI) are available on the app. The AQI is calculated using the measured concentrations of the three pollutants particulate matter (PM10), nitrogen dioxide (NO2) and ozone (O3), with the concentration with the poorest individual result determining the total result of the AQI. The AQI is divided into five classes: 'very good', 'good', 'moderate', 'good', 'very good'. For every AQI class, there is an assessment of whether or not air pollution is harmful to health or outdoor activities should be avoided. The app is ad-free and available for free.
Air data portal
The upgraded, newly designed online air data portal lets users get updated air quality information and do searches on current and past conditions: https://www.umweltbundesamt.de/daten/luft/luftdaten. A new feature is the air quality index which, just as the app does, provides a quick overview of current conditions. It also offers diagrams of AQI trends from past to present. The air data portal has maps of Germany which show the concentrations of one of five air pollutants (particulate matter, nitrogen dioxide, ozone, sulphur dioxide, carbon monoxide) in specific regions and on specific days, and in some cases times of day. There is also an ozone forecast for the current day and a two-day outlook. The measured concentrations for all five pollutants are up-to-date but historical data is also available. Users can look up data for several stations or pollutants and time periods. Results can also be downloaded. Tables of exceedances of the short-term limit and target values for particulate matter (PM10), nitrogen dioxide and ozone can be generated for the current year. An annual tabulation option enables users to compare annual mean values from earlier years for each pollutant, going back to 2000. Furthermore for any year and pollutant, the tables show data on exceedances of limit and target values at every station. The air data portal is best viewed with a desktop web browser.
Accuracy of data
All daily air quality data is provisional and has not been quality-assured.