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Last I looked this up it seemed like all the AQIs are pulling from essentially the same instrument design that is pretty off the shelf and is a discrete component you can buy. There are a few instrument variants iirc tho, and not all of them measure all what you want sometimes
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I have this one: amazon.com/gp/product/B07 It uses the same sensor as the PurpleAir (although the purpleair has two), and you have to plug it into a USB power bank, and there's no internet connectivity. It works fine for letting me know that the filters are working properly.
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