I don't know about 0.3 micron, but all the different sizes tend to come together. Presence of PM2.5 implies PM0.3 I've got a foobot, I like it. It was benchmar

I don't know about 0.3 micron, but all the different sizes tend to come together. Presence of PM2.5 implies PM0.3 I've got a foobot, I like it. It was benchmarked by some gov't agencies and found to track pretty well.