Air quality visualisations

A friend reports from Canada that smoke from the US wildfires is coming over, and showed me a rather spectacular animated visualisation:
http://firesmoke.ca/forecasts/current/

image

Ignore the horizontal black line: the US/CA border is just north of the worst air.

(This link will be a lot less exciting when there aren’t raging wildfires, but right now it’s very impressive.)

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Gratifyingly, the Luftdaten map is showing corresponding poor air quality:
(snapshot:

https://bristol.maps.sensor.community/#4/43.95/-100.32

… which kind of explains why all the sensors in Frome are showing Low: the scale has to cover quite a range.

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Slightly related, just seen Leaflet, a small open source mobile-friendly mapping library (uses openstreetmap by default)