SmogRank / World / India / Bihar / August 2025

Most polluted cities in Bihar, India, August 2025

16 cities in Bihar, India ranked by their average PM2.5 over the 31 days. Worst: Samāstipur at 47.2 µg/m³, #15 of 2,841 cities in the world. Cleanest: Munger at 17.7. 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.

← Buxar 95% 90%0
Every city in Bihar, India ranked for August 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
    95%
  2. 2Samāstipur
    86%
  3. 3Aurangābād
    43%
  4. 4Saharsa
    40%
  5. 5Chāpra
    36%
  6. 6Bhāgalpur
    30%
  7. 7Arāria
    24%
  8. 8Munger
    7%
  9. 9Gaya
    6%
  10. 10Purnia
    4%
  11. 11Katihar
    4%
  12. 12Muzaffarpur
    0%
  13. 13Begusarai
    0%
  14. 14Patna
    0%
  15. 15Bettiah
    0%
  16. 15Arrah
    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, August 2025, smogrank.com/in/region/bihar/history/2025-08 (accessed 6 Oct 2026).

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