Here’s a lab writeup comparing a few models from about a year ago: https://smartairfilters.com/en/blog/are-cheap-particle-counters-accurate/ https://smartairfi

Here’s a lab writeup comparing a few models from about a year ago: https://smartairfilters.com/en/blog/are-cheap-particle-counters-accurate/ https://smartairfilters.com/en/blog/are-cheap-particle-count... Depending on which part of the Middle East you’re in, you may need a PM10 (dust) monitor. The devices here just do PM2.5 (smog).