For example, PPM implies "parts per million". If you find out that the concentration of NO2textual content NO _2NO2​ is equivalent to 1 ppm, it means that if you are taking a "sample" of air and divide it into 1,000,000 areas, one of them will encompass NO2text NO _2NO2​. Converting https://jaidenkblve.blogsvila.com/36920521/the-5-second-trick-for-online-ppm-calculator