obra’s Twitter Archive—№ 40,257

RT @EricaJoy: heads up for folks using the LRAPA adjustment on purple air. (via thebolditalic.com/understanding-purpleair-vs-airnow-gov-measurements-of-wood-smoke-pollution-562923a55226)

https://pbs.twimg.com/media/EhUjbp5UcAA0LQi.jpg