Links of interest:
http://Maps.WHO.int/AirPollution/
NO2 hotspots (TROPOMI data through ESA Copernicus and KNMI) https://energydesk.carto.com/builder/4c2ece4f-3367-4432-a418-8ce61ca01801/embed
Top Questions
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How much worse is the typical subway air, compared to street-level air pollution, in a typical city?
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