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:

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]}

The correct answer is option 4, "parts per million" (ppm). Ppm is a unit of measurement used to express the concentration or presence of pollutants in the environment. It represents the ratio of the number of parts of a particular substance to one million parts of the entire mixture or solution. For example, if there are 100 ppm of a pollutant in the environment, it means that there are 100 parts of the pollutant in every one million parts of the total substance or mixture. This unit is commonly used because it allows for the measurement and comparison of small amounts of pollutants in a large volume. It is important for monitoring and assessing the environmental impact of pollutants.