1: India, with high levels of air pollution due to industrialization and vehicle emissions.

2: China, struggles with pollution from coal-fired power plants and heavy industries.

3: Bangladesh, facing challenges with air pollution from brick kilns and traffic congestion.

4: Pakistan, dealing with pollution from urbanization and industrial growth.

5: Indonesia, battling pollution from deforestation and forest fires.

6: Nigeria, grappling with air pollution from oil refineries and vehicle emissions.

7: Russia, plagued by pollution from industrial enterprises and vehicle emissions.

8: Saudi Arabia, facing pollution from oil refineries and desert dust.

9: United States, dealing with pollution from transportation and industrial activities.