Aggravating_Foot_528 t1_jdzkxkx wrote on March 28, 2023 at 10:38 AM

Reply to comment by 1MagnificentMagnolia in I guess I'll just air on the side of caution and hold my breath today by 1MagnificentMagnolia

EPA for that measure and then purple air is citizen scientists.

Purple air unfortunately read the pm2.5 a bit high. It's a well known issue with them. So EPA relies on their own monitors mainly. Also not all purple airs are placed in good locations (some read falsely high due to placement near vents etc ) and not all purple air are well maintained so will read high because of bugs in them,.other debris.

Aggravating_Foot_528 t1_jdzl1al wrote on March 28, 2023 at 10:40 AM

https://www.airnow.gov/about-airnow/