SmogRank / World / India / Bihar / March 2026

Most polluted cities in Bihar, India, March 2026

18 cities in Bihar, India ranked by their average PM2.5 over the 31 days. Worst: Hājīpur at 77.1 µg/m³, #19 of 2,947 cities in the world. Cleanest: Aurangābād at 20.7. 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.

← Patna 100% 75%0
Every city in Bihar, India ranked for March 2026, 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. 1Patna
    100%
  2. 2Hājīpur
    97%
  3. 3Muzaffarpur
    97%
  4. 4Purnia
    96%
  5. 5Gaya
    90%
  6. 6Saharsa
    88%
  7. 7Begusarai
    86%
  8. 8Mothīhāri
    80%
  9. 9Arāria
    70%
  10. 10Bhāgalpur
    67%
  11. 11Bihār Sharīf
    54%
  12. 12Kishanganj
    48%
  13. 13Rājgīr
    41%
  14. 14Bettiah
    36%
  15. 15Sasarām
    26%
  16. 16Katihar
    22%
  17. 17Munger
    21%
  18. 18Aurangābād
    4%
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 2026, smogrank.com/in/region/bihar/history/2026-03 (accessed 6 Oct 2026).

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