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World Air Quality Report 2025: Delhi Remains Most Polluted.

Ranks & Reports | Dated: 09 Mar 2026

Swiss organization IQAir released the World Air Quality Report 2025, ranking New Delhi as the world most polluted capital city for the fifth consecutive year. The report highlights severe PM2.5 concentrations across northern India, demanding urgent vehicular and industrial emission policies.

🎯 Key Highlights:

  • Begusarai in Bihar was named the most polluted metropolitan area globally.
  • Bangladesh was ranked as the most polluted country overall.
  • The data is compiled using ground-level air monitoring stations.

💡 Other Important Facts:

  • Report: World Air Quality.
  • Most Polluted Capital: New Delhi.
  • Publisher: IQAir.

📚 Test Your Knowledge:

According to the World Air Quality Report 2025 by IQAir, which city was ranked as the world most polluted capital?

Correct Answer: New Delhi

🚀 Quick Recap:

About IQAir

  • Headquarters - Goldach, Switzerland
  • Focus - Air Quality Technology