For example, PPM implies "components for each million". If you discover out the focus of NO2textual content NO _2NO2​ is equivalent to 1 ppm, it signifies that if you're taking a "sample" of air and divide it into 1,000,000 parts, one of them will consist of NO2text NO _2NO2​. Pieces https://omard681bdn7.wikitelevisions.com/user