Statement:
Australia is less polluted than Costa Rica

In the Most Polluted Countries rating Australia holds position #99 ²⁰²¹ out of 112 and Costa Rica is #90 out of 112 ²⁰²¹.
Position of Australia is better than position of Costa Rica.

Referencies:

1. Most Polluted Countries ²⁰²¹ by IQAir

   The countries in the rating sorted by 'Pollution Index' in descending order.

   Australia	'Pollution Index' value is	5.7
   Costa Rica	'Pollution Index' value is	7.8