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The presence of pollutants in the environment is usually expressed in ppm, where ppm stands for:
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- particles per mole
- purity per microgram
- pollutant prevent measures
- parts per million
Correct 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.
