SmogRank / World / India / Bihar / July 2026

Most polluted cities in Bihar, India, July 2026

10 cities in Bihar, India ranked by their average PM2.5 over the 31 days. Worst: Rājgīr at 56.1 µg/m³, #25 of 2,751 cities in the world. Cleanest: Katihar at 10.3. 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.

← Rājgīr 60% 50%0
Every city in Bihar, India ranked for July 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. 1Rājgīr
    60%
  2. 2Kishanganj
    36%
  3. 3Hājīpur
    26%
  4. 4Purnia
    26%
  5. 5Bhāgalpur
    24%
  6. 6Gaya
    19%
  7. 7Arāria
    10%
  8. 8Patna
    3%
  9. 9Muzaffarpur
    0%
  10. 10Katihar
    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

All cities in the world, July 2026 · All cities in India, July 2026 · Bihar now

Use this board

SmogRank, most polluted cities in Bihar, India, PM2.5, July 2026, smogrank.com/in/region/bihar/history/2026-07 (accessed 6 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.