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 9010.7×▼84
  2. 2Muzaffarpur 668.1×
  3. 3Patna 657.9×▼113
  4. 4Begusarai 657.7×▼133
  5. 5Arāria 637.6×▼132
  6. 6Kishanganj 617.4×
  7. 7Gaya 617.3×▼117
  8. 8Bhāgalpur 617.3×▼136
  9. 9Katihar 384.7×
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-index. 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/m³Good
Dinapur Nizamat≈ 24 µg/m³Good
Dinapore≈ 24 µg/m³Good
Madhurampur Dehri≈ 19 µg/m³Good
Bagaha≈ 23 µg/m³Good
Jamālpur≈ 19 µg/m³Good
Jahānābād≈ 25 µg/m³Good
Luckeesarai≈ 23 µg/m³Good
Nawāda≈ 20 µg/m³Good
Bagaha≈ 16 µg/m³Good
Jamūī≈ 16 µg/m³Good
Bāruni≈ 22 µg/m³Good
Phulwari Sharif≈ 24 µg/m³Good
Madhubani≈ 30 µg/m³Good
Benipur≈ 24 µg/m³Good
Barauni≈ 22 µg/m³Good
Bihāt≈ 22 µg/m³Good
Sītāmarhi≈ 29 µg/m³Good
Gopālganj≈ 27 µg/m³Good
Supaul≈ 22 µg/m³Good
Sheikhpura≈ 23 µg/m³Good
Bārh≈ 23 µg/m³Good
Mokameh≈ 23 µg/m³Good
Bangaon≈ 22 µg/m³Good
Masaurhi Buzurg≈ 24 µg/m³Good
Teghra≈ 22 µg/m³Good
Raxaul≈ 27 µg/m³Good
Madhepura≈ 23 µg/m³Good
Dumraon≈ 24 µg/m³Good
Sultānganj≈ 19 µg/m³Good
Daudnagar≈ 24 µg/m³Good
Arwal≈ 23 µg/m³Good
Khagaul≈ 24 µg/m³Good
Hilsa≈ 24 µg/m³Good
Fatwa≈ 24 µg/m³Good
Forbesganj≈ 30 µg/m³Good
Bhabhua≈ 21 µg/m³Good
Khagaria≈ 20 µg/m³Good
Narkatiāganj≈ 21 µg/m³Good
Naugachhia≈ 18 µg/m³Good

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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.

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