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1MagnificentMagnolia OP t1_jdzkeap wrote

It took a few tries but after several refreshes a reading came up... but got me wondering, who maintains the various sensors scattered around? Is it local government?

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Aggravating_Foot_528 t1_jdzkxkx wrote

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.

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