As an example, PPM implies "parts for each million". If you discover out the concentration of NO2textual content NO _2NO2 is equal to one ppm, it implies that if you take a "sample" of air and divide it into one million elements, one of these will include NO2textual content NO https://online-ppm-calculator97406.bligblogging.com/37432672/the-smart-trick-of-free-ppm-calculator-that-no-one-is-discussing