The International Day of Clean Air for blue skies is observed on ______.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 7 September.
- The International Day of Clean Air for blue skies is observed globally on 7 September.
- Aimed to strengthen international cooperation in improving air quality and reducing air pollution.
- The first observance of the International Day was held on 7 September 2020.