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| Q.5 | In September 2021 which air quality guideline annual mean values of gaseous nitrogen dioxide was set by the WHO to protect the public from the health effects of gaseous nitrogen dioxide? | |
| Ans | 1. 30 µg/m3 | |
| 2. 40 µg/m3 | ||
| 3. 20 µg/m3 | ||
| 4. 10 µg/m3 |
Correct Ans: 4
