Air quality monitors: paying more does not get you more accuracy
Author here.<p>I wrote this article a few weeks ago after discovering that a well known air quality monitor in the market that retails for more than USD 1000 actually uses a PM module that costs less than USD 20.<p>Often people assume that the more expensive, the better but as you can see in the article this is often not the case -especially when it comes to the accuracy of the monitor.<p>If you are looking for an open source / open hardware air quality monitor kit that uses high quality sensor modules and is very easy to assemble, have a look at the project we maintain. Instructions to built an indoor monitor [1], instructions to built an outdoor monitor [2] and overview of the kits [3]. All is open source (firmware, schematics, 3d files for enclosure, etc).<p>[1] <a href="https://www.airgradient.com/open-airgradient/instructions/diy-pro-v42/" rel="nofollow">https://www.airgradient.com/open-airgradient/instructions/di...</a><p>[2] <a href="https://www.airgradient.com/open-airgradient/instructions/diy-open-air-presoldered-v11/" rel="nofollow">https://www.airgradient.com/open-airgradient/instructions/di...</a><p>[3] <a href="https://www.airgradient.com/open-airgradient/kits/" rel="nofollow">https://www.airgradient.com/open-airgradient/kits/</a>