Statement:
Mongolia is less polluted than Nigeria

In the Most Polluted Countries rating Mongolia holds position #20 2021 out of 112 and Nigeria is #18 out of 112 2021.
Position of Mongolia is better than position of Nigeria.

Referencies:

  1. Most Polluted Countries 2021 by IQAir
    The countries in the rating sorted by 'Pollution Index' in descending order.
    Mongolia 'Pollution Index' value is 33.1
    Nigeria 'Pollution Index' value is 34.0