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.

West Bengal: 6 measured citiesSikkimBihar: 11 measured citiesMadhya Pradesh: 10 measured citiesUttar Pradesh: 21 measured citiesChhattisgarh: 5 measured citiesJharkhand#9 Katihar: 23.4 µg/m³#7 Gaya: 36.5 µg/m³#8 Bhāgalpur: 36.5 µg/m³#6 Kishanganj: 37.2 µg/m³#5 Arāria: 38.0 µg/m³#4 Begusarai: 38.6 µg/m³#3 Patna: 39.3 µg/m³#2 Muzaffarpur: 40.4 µg/m³#1 Hājīpur: 53.5 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Hājīpur 53.5 WHO annual guideline
Every measured city in Bihar, India, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Hājīpur 610.7×
  2. 2Muzaffarpur 58.1×
  3. 3Patna 47.9×
  4. 4Begusarai 47.7×
  5. 5Arāria 47.6×
  6. 6Kishanganj 47.4×
  7. 7Gaya 47.3×
  8. 8Bhāgalpur 47.3×
  9. 9Katihar 34.7×
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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.

City7-day estimateBand
Darbhanga≈ 24 µg/m³Low risk
Dinapur Nizamat≈ 24 µg/m³Low risk
Dinapore≈ 24 µg/m³Low risk
Madhurampur Dehri≈ 19 µg/m³Low risk
Bagaha≈ 23 µg/m³Low risk
Jamālpur≈ 19 µg/m³Low risk
Jahānābād≈ 25 µg/m³Low risk
Luckeesarai≈ 23 µg/m³Low risk
Nawāda≈ 20 µg/m³Low risk
Bagaha≈ 16 µg/m³Low risk
Jamūī≈ 16 µg/m³Low risk
Bāruni≈ 22 µg/m³Low risk
Phulwari Sharif≈ 24 µg/m³Low risk
Madhubani≈ 30 µg/m³Moderate risk
Benipur≈ 24 µg/m³Low risk
Barauni≈ 22 µg/m³Low risk
Bihāt≈ 22 µg/m³Low risk
Sītāmarhi≈ 29 µg/m³Low risk
Gopālganj≈ 27 µg/m³Low risk
Supaul≈ 22 µg/m³Low risk
Sheikhpura≈ 23 µg/m³Low risk
Bārh≈ 23 µg/m³Low risk
Mokameh≈ 23 µg/m³Low risk
Bangaon≈ 22 µg/m³Low risk
Masaurhi Buzurg≈ 24 µg/m³Low risk
Teghra≈ 22 µg/m³Low risk
Raxaul≈ 27 µg/m³Low risk
Madhepura≈ 23 µg/m³Low risk
Dumraon≈ 24 µg/m³Low risk
Sultānganj≈ 19 µg/m³Low risk
Daudnagar≈ 24 µg/m³Low risk
Arwal≈ 23 µg/m³Low risk
Khagaul≈ 24 µg/m³Low risk
Hilsa≈ 24 µg/m³Low risk
Fatwa≈ 24 µg/m³Low risk
Forbesganj≈ 30 µg/m³Low risk
Bhabhua≈ 21 µg/m³Low risk
Khagaria≈ 20 µg/m³Low risk
Narkatiāganj≈ 21 µg/m³Low risk
Naugachhia≈ 18 µg/m³Low risk

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SmogRank, most polluted cities in Bihar, India, PM2.5, this year to 2 Oct 2026, 03:00 UTC, smogrank.com/in/region/bihar?w=year.

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Updated 2026-10-02 03:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.