Visit https://waqi.info/ and click on the interactive map to select the closest measuring station to your desired location. You will be presented with the real-time World Air Quality Index, namely PM2.5 pollutants (dust particle diameter of up to 2.5 microns), PM10 (dust particle diameter of up to 10 microns), O3 (ozone), NO2, SO2, CO. This unique worldwide project has been gathering data since 2007 from more than 9,000 measuring stations in 600 major cities across more than 70 countries worldwide, including the Czech Republic. (Note: The Czech Republic data is provided by the Czech Hydrometeorological Institute. If you select, for example, Legerova street in Prague, you will therefore see the same numbers as at
For your convenience, the air quality data page also contains a prediction for the following days and a link to ready-made widgets for mobile phones. You will then have data on your location available in real time 24/7.