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, #111 in the world.

The 457 monitors run by CPCB 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; they return when the data does.

← Hājīpur 53.5 WHO annual guideline

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	Band
Darbhanga	≈ 24 µg/m³	Moderate
Dinapur Nizamat	≈ 24 µg/m³	Moderate
Dinapore	≈ 24 µg/m³	Moderate
Madhurampur Dehri	≈ 19 µg/m³	Moderate
Bagaha	≈ 23 µg/m³	Moderate
Jamālpur	≈ 19 µg/m³	Moderate
Jahānābād	≈ 25 µg/m³	Moderate
Luckeesarai	≈ 23 µg/m³	Moderate
Nawāda	≈ 20 µg/m³	Moderate
Bagaha	≈ 16 µg/m³	Moderate
Jamūī	≈ 16 µg/m³	Moderate
Bāruni	≈ 22 µg/m³	Moderate
Phulwari Sharif	≈ 24 µg/m³	Moderate
Madhubani	≈ 30 µg/m³	Moderate
Benipur	≈ 24 µg/m³	Moderate
Barauni	≈ 22 µg/m³	Moderate
Bihāt	≈ 22 µg/m³	Moderate
Sītāmarhi	≈ 29 µg/m³	Moderate
Gopālganj	≈ 27 µg/m³	Moderate
Supaul	≈ 22 µg/m³	Moderate
Sheikhpura	≈ 23 µg/m³	Moderate
Bārh	≈ 23 µg/m³	Moderate
Mokameh	≈ 23 µg/m³	Moderate
Bangaon	≈ 22 µg/m³	Moderate
Masaurhi Buzurg	≈ 24 µg/m³	Moderate
Teghra	≈ 22 µg/m³	Moderate
Raxaul	≈ 27 µg/m³	Moderate
Madhepura	≈ 23 µg/m³	Moderate
Dumraon	≈ 24 µg/m³	Moderate
Sultānganj	≈ 19 µg/m³	Moderate
Daudnagar	≈ 24 µg/m³	Moderate
Arwal	≈ 23 µg/m³	Moderate
Khagaul	≈ 24 µg/m³	Moderate
Hilsa	≈ 24 µg/m³	Moderate
Fatwa	≈ 24 µg/m³	Moderate
Forbesganj	≈ 30 µg/m³	Moderate
Bhabhua	≈ 21 µg/m³	Moderate
Khagaria	≈ 20 µg/m³	Moderate
Narkatiāganj	≈ 21 µg/m³	Moderate
Naugachhia	≈ 18 µg/m³	Moderate

Use this board

SmogRank, most polluted cities in Bihar, India, PM2.5, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/in/region/bihar?w=year.

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.