Stay safe if you must go outside today. In San Francisco, my air quality detector measured an AQI of 501 just now - Hazardous conditions. wear a mask outside, filter air inside.pic.twitter.com/7bgRYnGbf9
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@KarendeSa1 the news reporting 160-180. It’s so much worse outside and people are walking around without masks on because they’re unaware.
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