MCQOPTIONS
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MCQOPTIONS
| 1. |
The permissible concentration of PM 10 in the air is ___________ |
| A. | 60μg/m3 |
| B. | 40μg/m3 |
| C. | 50μg/m3 |
| D. | 20μg/m3 |
| Answer» B. 40μg/m3 | |