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
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Agree, unclear of pure accuracy but after using it for a few days and calibrating against another device it’s for sure directionally correct and seems fairly accurate.