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Hacker News
Realtime California Air Quality
https://www.purpleair.com/map?opt=1%2Fi%2FmAQI%2Fa10%2FcC4#7.22/37.494/-120.928
59 comments
23/8/2020
Real-time air pollution map
https://www.purpleair.com/map#1/25/-30
45 comments
19/12/2018