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Some background During the pandemic, with way too much time on my hands, wildfires blazing across the west coast, and official purple air sensors costing pushing $269 I decided that this was certainly something I could buid myself! I had a few ESP32 boards laying around and was able to quickly order a PMS5003 laser sensor that could detect a range of particle sizes from 0.3um to 10um. What surprised me was, with everything wired up and my sensor outputting a deluge of data points informing me about the sizes and distributions of particles getting sucked into my lungs, I had no idea what any of it meant!...