Question

 The concentration of pollutants in water or atmosphere is often expressed in terms of

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Answer 1

Answer:

HEY MATE

Explanation:

PM is most usually (but not always) expressed as mg/m3 of air or other gas at a specified temperature and pressure. For gases, volume percent = mole percent. 1 volume percent = 10,000 ppmv (i.e., parts per million by volume) with a million being defined as 106.

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Answer 2

Answer:

PPM

Explanation:

Its expressed in Parts Per Million

$PPM= \frac{Amount of whole solution}{Amount of solute} * 10^{6}$