[ubercow13]

It seems to be more useful in the current format if you are trying to decide where (not) to live

[eatbitseveryday]

Why pick one city which is clean but maybe 50km from another which is heavily polluted? I'd rather know pollution like a weather radar shows clouds or cold fronts... Then I can just eliminate entire regions for where to live.

[mikkei]

Like this visualisation you mean ? https://www.airvisual.com/earth You can see the whole world with particulate matters clouds and how they are affected by the wind.