For example, PPM indicates "components for each million". If you discover out that the focus of NO2text NO _2NO2​ is equal to 1 ppm, it implies that if you take a "sample" of air and divide it into 1,000,000 pieces, one of them will encompass NO2textual content NO _2NO2​. Components https://gregoryouxxy.blazingblog.com/36674398/free-ppm-calculator-an-overview