SmogRank / World / India / Bihar / March 2025

Most polluted cities in Bihar, India, March 2025

19 cities in Bihar, India ranked by their average PM2.5 over the 31 days. Worst: Hājīpur at 105.2 µg/m³, #4 of 2,809 cities in the world. Cleanest: Arrah at 26.3. 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.

← Hājīpur 100% 75%0
Every city in Bihar, India ranked for March 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. 1Hājīpur
    100%
  2. 2Sasarām
    100%
  3. 3Patna
    100%
  4. 4Muzaffarpur
    97%
  5. 5Aurangābād
    96%
  6. 6Munger
    90%
  7. 7Purnia
    89%
  8. 8Begusarai
    86%
  9. 9Mothīhāri
    79%
  10. 10Gaya
    71%
  11. 11Buxar
    70%
  12. 12Saharsa
    65%
  13. 13Arāria
    64%
  14. 14Bhāgalpur
    63%
  15. 15Katihar
    62%
  16. 16Bettiah
    61%
  17. 17Samāstipur
    23%
  18. 18Kishanganj
    20%
  19. 19Arrah
    17%
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, March 2025, smogrank.com/in/region/bihar/history/2025-03 (accessed 6 Oct 2026).

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