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How is the concentration of pollutants in water or atmosphere often expressed?

Options

  1. AParts per million (ppm)
  2. BParts per billion (ppb)
  3. CPercentage (%)
  4. DMolarity (M)

Correct answer

A. Parts per million (ppm)

Step-by-step solution

The paragraph mentions that the concentration of pollutants in water or atmosphere is often expressed in terms of ppm.

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