I use something like this handheld air quality monitor. It's been close enough a...

		novok on Sept 15, 2020 \| parent \| context \| favorite \| on: 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...