When I was looking into air quality a year or two ago, I realized that the color-coded "AQI" so popular are not precisely a scientific analysis, as they are a b

When I was looking into air quality a year or two ago, I realized that the color-coded "AQI" so popular are not precisely a scientific analysis, as they are a blend of different measurements, with cutoffs specified by committee. Different countries have different formulas for AQI. That doesn't make them wrong, but it makes them not a "gospel truth". I have a Dylos rigged up inside my apartment, feeding particle measurement data to a serial port, which stores the data on my own cloud. I don't bother with AQI.