The first International Day of Clean Air for blue skies is/was celebrated in which year?

The first International Day of Clean Air for blue skies is/was celebrated in which year?

important days mcqs

Q. The first International Day of Clean Air for blue skies is/was celebrated in which year?

  1. 2017
  2. 2018
  3. 2019
  4. 2020

Answer: 2020

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