From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
Question: From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
[A].
1
5
50
500
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
No answer description available for this question.