The presence of pollutants in the environment is usually expressed in ppm, where ppm stands for:

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Q: 163 (SSC/NA)
The presence of pollutants in the environment is usually expressed in ppm, where ppm stands for:
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question_subject: 

Science

question_exam: 

SSC

stats: 

0,249,43,28,5,10,249

keywords: 

{'pollutants': [1, 0, 0, 2], 'pollutant prevent measures': [1, 0, 0, 0], 'ppm': [1, 0, 0, 0], 'environment': [2, 0, 0, 3], 'particles': [1, 0, 5, 16], 'mole': [1, 1, 1, 4], 'purity': [1, 0, 1, 1]}