1: India - Home to some of the world's most polluted cities.

2: Bangladesh - Air quality issues threaten residents' health.

3: Pakistan - Pollution from industry and vehicles impacts citizens.

4: Nigeria - Pollution from oil spills and urbanization harms environment.

5: China - Rapid industrialization leads to severe air and water pollution.

6: Indonesia - Deforestation and waste contribute to environmental pollution.

7: Iran - Poor air quality in major cities poses health risks to inhabitants.

8: Saudi Arabia - Oil industry pollution affects air and water quality.

9: Egypt - Population growth and industrialization contribute to pollution levels.

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