The presence of pollutants in the environment is usually expressed in ppm, where ppm stands for: A)particles per mole B)purity per microgram C)pollutant prevent measures D)parts per million
Option D) PPM is an abbreviation of Parts Per Million. It is commonly used as a measure of small levels of pollutants in air, water, body fluids, etc. Parts per million is the mass ratio between the pollutant component and the solution
