In addition to my sibling commenter, there is also: http://www.airqualitynow.eu/ http://www.airqualitynow.eu/ However, city-specific readings are not always r

In addition to my sibling commenter, there is also: http://www.airqualitynow.eu/ http://www.airqualitynow.eu/ However, city-specific readings are not always reliable, as they are based on a very localized meter in one particular place that can rarely reveal the overall situation for an entire city. I prefer air pollution maps that show the overall state for a big region, like the one I linked to.