SmogRank / World / India / Bihar / November 2025

Most polluted cities in Bihar, India, November 2025

20 cities in Bihar, India ranked by their average PM2.5 over the 30 days. Worst: Aurangābād at 84.5 µg/m³, #64 of 2,662 cities in the world. Cleanest: Chāpra at 35.8. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Buxar 100% 75%0
Every city in Bihar, India ranked for November 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Buxar
    100%
  2. 2Hājīpur
    96%
  3. 3Munger
    96%
  4. 4Bettiah
    96%
  5. 5Rājgīr
    96%
  6. 6Patna
    93%
  7. 7Gaya
    93%
  8. 8Muzaffarpur
    93%
  9. 9Bihār Sharīf
    92%
  10. 10Purnia
    85%
  11. 11Begusarai
    84%
  12. 12Arāria
    81%
  13. 13Saharsa
    81%
  14. 14Katihar
    80%
  15. 15Aurangābād
    77%
  16. 16Mothīhāri
    77%
  17. 17Bhāgalpur
    69%
  18. 18Arrah
    62%
  19. 19Sasarām
    61%
  20. 20Chāpra
    48%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities in Bihar, India, PM2.5, November 2025, smogrank.com/in/region/bihar/history/2025-11 (accessed 6 Oct 2026).

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