SmogRank / World / India / Bihar / May 2026

Most polluted cities in Bihar, India, May 2026

15 cities in Bihar, India ranked by their average PM2.5 over the 31 days. Worst: Hājīpur at 57.3 µg/m³, #37 of 2,852 cities in the world. Cleanest: Katihar at 11.0. 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.

← Kishanganj 86% 80%0
Every city in Bihar, India ranked for May 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. 1Kishanganj
    86%
  2. 2Hājīpur
    85%
  3. 3Muzaffarpur
    71%
  4. 4Patna
    55%
  5. 5Begusarai
    54%
  6. 6Purnia
    52%
  7. 7Gaya
    41%
  8. 8Bhāgalpur
    40%
  9. 9Buxar
    32%
  10. 10Mothīhāri
    26%
  11. 11Bihār Sharīf
    21%
  12. 12Munger
    5%
  13. 13Arrah
    4%
  14. 14Arāria
    0%
  15. 15Katihar
    0%
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, May 2026, smogrank.com/in/region/bihar/history/2026-05 (accessed 6 Oct 2026).

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