SmogRank / World / Asia / India / Bihar
Most polluted cities in Bihar, India
9 measured cities, this year; 9 above the WHO annual guideline. Worst: Hājīpur at 53.5 µg/m³, #35 in the world.
464 monitors in India haven't reported for more than two days. Cities that rely on them are missing from the 24-hour board and may drop from the longer ones; that isn't clean air, and they return when the data does.
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.
- 1Hājīpurlast full day 30 Sept 67%
- 2Muzaffarpurlast full day 30 Sept 57%
- 3Begusarailast full day 30 Sept 54%
- 4Patnalast full day 30 Sept 53%
- 5Gayalast full day 30 Sept 51%
- 6Kishanganjlast full day 30 Sept 43%
- 7Arārialast full day 30 Sept 43%
- 8Bhāgalpurlast full day 30 Sept 42%
- 9Katiharlast full day 30 Sept 17%
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
Estimated: cities without a monitor
Bihar cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Darbhanga | ≈ 59 µg/m³ |
| Dinapur Nizamat | ≈ 55 µg/m³ |
| Dinapore | ≈ 55 µg/m³ |
| Madhurampur Dehri | ≈ 47 µg/m³ |
| Bagaha | ≈ 43 µg/m³ |
| Jamālpur | ≈ 48 µg/m³ |
| Jahānābād | ≈ 57 µg/m³ |
| Aurangābād | ≈ 53 µg/m³ |
| Luckeesarai | ≈ 52 µg/m³ |
| Nawāda | ≈ 45 µg/m³ |
| Bagaha | ≈ 36 µg/m³ |
| Jamūī | ≈ 40 µg/m³ |
| Bāruni | ≈ 53 µg/m³ |
| Phulwari Sharif | ≈ 55 µg/m³ |
| Madhubani | ≈ 70 µg/m³ |
| Benipur | ≈ 59 µg/m³ |
| Barauni | ≈ 53 µg/m³ |
| Bihāt | ≈ 53 µg/m³ |
| Sītāmarhi | ≈ 67 µg/m³ |
| Gopālganj | ≈ 67 µg/m³ |
| Supaul | ≈ 57 µg/m³ |
| Sheikhpura | ≈ 52 µg/m³ |
| Bārh | ≈ 54 µg/m³ |
| Mokameh | ≈ 52 µg/m³ |
| Bangaon | ≈ 57 µg/m³ |
| Masaurhi Buzurg | ≈ 53 µg/m³ |
| Teghra | ≈ 53 µg/m³ |
| Raxaul | ≈ 67 µg/m³ |
| Madhepura | ≈ 59 µg/m³ |
| Dumraon | ≈ 59 µg/m³ |
| Sultānganj | ≈ 50 µg/m³ |
| Daudnagar | ≈ 57 µg/m³ |
| Arwal | ≈ 57 µg/m³ |
| Khagaul | ≈ 55 µg/m³ |
| Hilsa | ≈ 53 µg/m³ |
| Fatwa | ≈ 55 µg/m³ |
| Forbesganj | ≈ 73 µg/m³ |
| Bhabhua | ≈ 48 µg/m³ |
| Khagaria | ≈ 52 µg/m³ |
| Narkatiāganj | ≈ 44 µg/m³ |
Bad-air episodes in Bihar
- Eastern India, 28 September to 1 October 20264 days15 cities85 µg/m³peak, Dera Colliery Township
- North-eastern India and Bhutan, September 20264 to 9 September 2026, 6 days15 cities107 µg/m³peak, Bihār Sharīf
- Bihar, Odisha and Uttar Pradesh, India, August 202621 to 23 August 2026, 3 days10 cities208 µg/m³peak, Sasarām
- North-eastern India, July 202611 to 14 July 2026, 4 days23 cities149 µg/m³peak, Arrah
- Northern India, May 202616 to 21 May 2026, 6 days17 cities321 µg/m³peak, Bettiah
- Eastern India, April 202623 to 25 April 2026, 3 days14 cities145 µg/m³peak, Singrauli
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in Bihar, India, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/in/region/bihar?w=year.
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.
Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.