From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
Correct answer: A. 5
- A. 5
- B. 50
- C. 500
- D. 5000
Explanation
A commonly cited permissible or threshold concentration for sulphur dioxide in air is about 5 ppm, although modern ambient-air standards are often much stricter and expressed over specified averaging times. The other choices are excessively high for SO2 exposure.
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