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novok
on Sept 15, 2020
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Oregon’s air quality is so hazardous that no one k...
I use something like this handheld air quality monitor. It's been close enough and useful enough to figure out how well my filter is working:
https://www.aliexpress.com/item/4000312301074.html?spm=a2g0o...
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https://www.aliexpress.com/item/4000312301074.html?spm=a2g0o...