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