Air Pollution in Mega Cities

Air Pollution in Mega Cities

Do you know, how the trace gas loading (as seen from the incorruptible satellite view) is evolving over your inhabited area? Or over other inhabited areas of interest? The Air Pollution in Megacities pilot evolves the tropospheric NO2 tropospheric columns as derived from the polar-orbiting European satellite fleet MetOp-A, MetOp-B and MetOp-C. Sentinel 5P data will also be incorporated.


As a result, you have a time series of 13 years (and after the de-orbiting of MetOp-C of 25 years) with a similar instrument with similar characteristics. This global service provides you with perfect insight into trends of tropospheric NO2 in your local area of interest. To realize the objectives it consists of four components:


  1. Urban Area Selector (UAS): The urban areas of interest can be defined by means of the Global Urban Footprint (GUF) which has been derived from EO data by worldwide mapping of settlements. A total of 180 000 TerraSAR-X and TanDEM-X scenes have been processed to create the GUF. The settlement pattern allows for the analysis of urban structures and the arrangement of rural and urban areas. The GUF is available as a DLR Geoservice for scientific use
  2. Time Series Processor (TSP): To quantify the related air pollution levels for the selected urban area satellite-based observations are examined using the NextGEOSS infrastructure. The discovery services are used to choose available EO data e.g. of GOME-2 (2007-present) and the upcoming Copernicus fleet (Sentinel-5P, Sentinel-3) but also available data from the Copernicus Atmosphere Monitoring Service (CAMS). Here the NextGEOSS DataHub plays the key role. The backend for the Time Series Processor (TSP) is deployed within the NextGEOSS Public Cloud
  3. Time Series Viewer (TSV): The Times Series Viewer is realized as a web client. To enhance the interpretation of the resulting time series a time slider functionality is available
  4. Time Series Analyser (TSA): A web client enables the user to interactively analyze the resulting time series. The main features comprise the computation of basic statistics and the detection of trends


Comming soon!


Global Coverage.

The services primarily make use of MetOp-A/B/C data. Sentinel 5P will be incorporated. Any other dataset with an identical three-dimensional structure (latitude – longitude and time) may be applied, such as Copernicus Atmosphere Monitoring Service-air quality data.

Scientists, journalists and citizen who are interested in air quality in their local area.

The pilot application shows the evolution of tropospheric NO2 over a user-selected inhabited area as derived from the GOME-2 instruments aboard the European polar-orbiting satellites MetOp-A/B/C with respect to time.

Learn more about the pilot results at NextGEOSS Catalogue/Thematic Areas/Air Pollution.