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From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
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From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
A. 5
B. 50
C. 500
D. 5000
Correct Answer:
5
✔
Last Updated:
March 11, 2019