By way of example, PPM implies "components per million". If you find out which the concentration of NO2text NO _2NO2​ is equal to one ppm, it implies that if you are taking a "sample" of air and divide it into 1,000,000 components, one of these will include NO2textual content NO https://marioegark.thekatyblog.com/35234190/a-secret-weapon-for-ppm-calculator