High Dynamic Range DIY Air Testing

DIY testing of air cleaning is practical, and thoughtful experimental design can substitute for high-quality sensors including for evaluating air purifier setups that give >100,000x particle reductions. I've done a lot of DIY testing over the years ( 1 , 2 , 3 , 4 , 5 , 6 ). The goal is generally to understand how well something removes particles from the air. A professional particle counter (…