SmogRank / India / Bihar

Air quality in Arrah

Bihar, India. PM2.5 from 1 reference monitor, updated hourly.

– µg/m³

No reading in the last few days.

Rank

24 h
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not enough data
7 days
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not enough data
30 days
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not enough data
Year
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not enough data

Why it ranks here

Seasonal. Over the past year its worst months were July, December, averaging up to 79.5 µg/m³ against 20.9 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Arrah's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 0 days, hour by hour

No hourly readings yet.

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: no data2025-09-30: 17.4 µg/m³2025-10-01: 17.5 µg/m³2025-10-02: 17.4 µg/m³2025-10-03: no data2025-10-04: no data2025-10-05: 17.4 µg/m³2025-10-06: 17.4 µg/m³2025-10-07: 17.5 µg/m³2025-10-08: 17.3 µg/m³2025-10-09: 17.5 µg/m³2025-10-10: 17.2 µg/m³2025-10-11: 17.4 µg/m³2025-10-12: 17.4 µg/m³2025-10-13: 17.4 µg/m³2025-10-14: no data2025-10-15: 17.5 µg/m³2025-10-16: 17.3 µg/m³2025-10-17: 17.2 µg/m³2025-10-18: 17.5 µg/m³2025-10-19: 17.3 µg/m³2025-10-20: 24.9 µg/m³2025-10-21: 57.1 µg/m³2025-10-22: 20.3 µg/m³2025-10-23: no data2025-10-24: 22.8 µg/m³2025-10-25: 22.5 µg/m³2025-10-26: no data2025-10-27: 23.5 µg/m³2025-10-28: 31.3 µg/m³2025-10-29: no data2025-10-30: no data2025-10-31: no data2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: 23.0 µg/m³2025-11-06: 24.9 µg/m³2025-11-07: 25.8 µg/m³2025-11-08: 26.5 µg/m³2025-11-09: 27.9 µg/m³2025-11-10: no data2025-11-11: 25.1 µg/m³2025-11-12: 25.8 µg/m³2025-11-13: 25.7 µg/m³2025-11-14: 43.0 µg/m³2025-11-15: 38.7 µg/m³2025-11-16: 39.2 µg/m³2025-11-17: 81.2 µg/m³2025-11-18: no data2025-11-19: no data2025-11-20: 76.6 µg/m³2025-11-21: 71.5 µg/m³2025-11-22: 82.5 µg/m³2025-11-23: 86.1 µg/m³2025-11-24: 82.2 µg/m³2025-11-25: 67.9 µg/m³2025-11-26: 65.4 µg/m³2025-11-27: 69.7 µg/m³2025-11-28: no data2025-11-29: no data2025-11-30: 60.4 µg/m³2025-12-01: no data2025-12-02: no data2025-12-03: 79.5 µg/m³2025-12-04: 74.1 µg/m³2025-12-05: 66.4 µg/m³2025-12-06: 76.8 µg/m³2025-12-07: 85.2 µg/m³2025-12-08: 124.0 µg/m³2025-12-09: 110.0 µg/m³2025-12-10: 65.3 µg/m³2025-12-11: 95.1 µg/m³2025-12-12: 114.0 µg/m³2025-12-13: 84.5 µg/m³2025-12-14: 42.5 µg/m³2025-12-15: 42.1 µg/m³2025-12-16: 50.8 µg/m³2025-12-17: 57.7 µg/m³2025-12-18: 47.0 µg/m³2025-12-19: 49.3 µg/m³2025-12-20: 45.6 µg/m³2025-12-21: 65.4 µg/m³2025-12-22: 88.0 µg/m³2025-12-23: 92.2 µg/m³2025-12-24: 93.1 µg/m³2025-12-25: no data2025-12-26: no data2025-12-27: 82.3 µg/m³2025-12-28: 46.8 µg/m³2025-12-29: 53.6 µg/m³2025-12-30: no data2025-12-31: 77.1 µg/m³2026-01-01: 90.2 µg/m³2026-01-02: 110.0 µg/m³2026-01-03: no data2026-01-04: 50.8 µg/m³2026-01-05: 84.3 µg/m³2026-01-06: 89.5 µg/m³2026-01-07: 91.0 µg/m³2026-01-08: 107.0 µg/m³2026-01-09: 93.5 µg/m³2026-01-10: no data2026-01-11: no data2026-01-12: no data2026-01-13: no data2026-01-14: no data2026-01-15: no data2026-01-16: no data2026-01-17: no data2026-01-18: no data2026-01-19: no data2026-01-20: no data2026-01-21: 31.1 µg/m³2026-01-22: 25.8 µg/m³2026-01-23: no data2026-01-24: 40.6 µg/m³2026-01-25: 33.7 µg/m³2026-01-26: 21.7 µg/m³2026-01-27: 25.2 µg/m³2026-01-28: 29.7 µg/m³2026-01-29: 16.1 µg/m³2026-01-30: 20.2 µg/m³2026-01-31: 27.5 µg/m³2026-02-01: 25.9 µg/m³2026-02-02: 28.4 µg/m³2026-02-03: no data2026-02-04: no data2026-02-05: 16.6 µg/m³2026-02-06: 19.0 µg/m³2026-02-07: 16.3 µg/m³2026-02-08: no data2026-02-09: 20.9 µg/m³2026-02-10: 19.2 µg/m³2026-02-11: 20.0 µg/m³2026-02-12: 21.0 µg/m³2026-02-13: 16.9 µg/m³2026-02-14: 21.2 µg/m³2026-02-15: 42.8 µg/m³2026-02-16: no data2026-02-17: no data2026-02-18: no data2026-02-19: no data2026-02-20: 53.8 µg/m³2026-02-21: 42.4 µg/m³2026-02-22: 38.7 µg/m³2026-02-23: 44.2 µg/m³2026-02-24: 50.5 µg/m³2026-02-25: 54.8 µg/m³2026-02-26: 51.0 µg/m³2026-02-27: 42.0 µg/m³2026-02-28: 39.7 µg/m³2026-03-01: 39.7 µg/m³2026-03-02: 37.1 µg/m³2026-03-03: 55.3 µg/m³2026-03-04: no data2026-03-05: no data2026-03-06: 67.5 µg/m³2026-03-07: 79.3 µg/m³2026-03-08: 79.3 µg/m³2026-03-09: 80.3 µg/m³2026-03-10: no data2026-03-11: 77.4 µg/m³2026-03-12: 60.9 µg/m³2026-03-13: 54.0 µg/m³2026-03-14: 53.9 µg/m³2026-03-15: 61.2 µg/m³2026-03-16: 49.6 µg/m³2026-03-17: no data2026-03-18: no data2026-03-19: 63.2 µg/m³2026-03-20: 53.3 µg/m³2026-03-21: 19.9 µg/m³2026-03-22: 27.5 µg/m³2026-03-23: no data2026-03-24: no data2026-03-25: no data2026-03-26: 38.3 µg/m³2026-03-27: no data2026-03-28: 16.3 µg/m³2026-03-29: no data2026-03-30: no data2026-03-31: 46.1 µg/m³2026-04-01: 48.1 µg/m³2026-04-02: 30.4 µg/m³2026-04-03: no data2026-04-04: 24.6 µg/m³2026-04-05: no data2026-04-06: 22.5 µg/m³2026-04-07: 36.5 µg/m³2026-04-08: 41.2 µg/m³2026-04-09: 28.9 µg/m³2026-04-10: 26.2 µg/m³2026-04-11: 30.6 µg/m³2026-04-12: 33.3 µg/m³2026-04-13: 43.2 µg/m³2026-04-14: 41.3 µg/m³2026-04-15: 57.4 µg/m³2026-04-16: no data2026-04-17: 39.1 µg/m³2026-04-18: 43.7 µg/m³2026-04-19: 35.7 µg/m³2026-04-20: 36.4 µg/m³2026-04-21: 54.6 µg/m³2026-04-22: 46.4 µg/m³2026-04-23: 51.5 µg/m³2026-04-24: 41.2 µg/m³2026-04-25: 44.1 µg/m³2026-04-26: 23.6 µg/m³2026-04-27: no data2026-04-28: no data2026-04-29: 27.3 µg/m³2026-04-30: 13.2 µg/m³2026-05-01: 18.2 µg/m³2026-05-02: 14.8 µg/m³2026-05-03: 19.7 µg/m³2026-05-04: 16.2 µg/m³2026-05-05: 10.6 µg/m³2026-05-06: no data2026-05-07: no data2026-05-08: 22.6 µg/m³2026-05-09: 14.8 µg/m³2026-05-10: 17.1 µg/m³2026-05-11: 19.8 µg/m³2026-05-12: 25.3 µg/m³2026-05-13: 16.2 µg/m³2026-05-14: 16.0 µg/m³2026-05-15: 23.0 µg/m³2026-05-16: 26.5 µg/m³2026-05-17: 37.1 µg/m³2026-05-18: 32.3 µg/m³2026-05-19: 21.7 µg/m³2026-05-20: 28.6 µg/m³2026-05-21: 24.5 µg/m³2026-05-22: 20.4 µg/m³2026-05-23: 32.2 µg/m³2026-05-24: 27.8 µg/m³2026-05-25: 25.2 µg/m³2026-05-26: 18.6 µg/m³2026-05-27: no data2026-05-28: 13.3 µg/m³2026-05-29: no data2026-05-30: 13.2 µg/m³2026-05-31: 18.4 µg/m³2026-06-01: 13.6 µg/m³2026-06-02: 15.2 µg/m³2026-06-03: 17.9 µg/m³2026-06-04: 25.8 µg/m³2026-06-05: 23.7 µg/m³2026-06-06: no data2026-06-07: 10.3 µg/m³2026-06-08: 17.8 µg/m³2026-06-09: 14.7 µg/m³2026-06-10: no data2026-06-11: no data2026-06-12: no data2026-06-13: no data2026-06-14: 17.6 µg/m³2026-06-15: 19.0 µg/m³2026-06-16: 22.3 µg/m³2026-06-17: no data2026-06-18: no data2026-06-19: 20.8 µg/m³2026-06-20: 22.8 µg/m³2026-06-21: 20.1 µg/m³2026-06-22: 20.5 µg/m³2026-06-23: no data2026-06-24: no data2026-06-25: no data2026-06-26: 180.0 µg/m³2026-06-27: 37.5 µg/m³2026-06-28: 38.2 µg/m³2026-06-29: 25.4 µg/m³2026-06-30: no data2026-07-01: 36.6 µg/m³2026-07-02: 31.4 µg/m³2026-07-03: 28.9 µg/m³2026-07-04: no data2026-07-05: no data2026-07-06: 186.0 µg/m³2026-07-07: 281.0 µg/m³2026-07-08: 184.0 µg/m³2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: 149.0 µg/m³2026-07-13: 92.4 µg/m³2026-07-14: no data2026-07-15: 24.3 µg/m³2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: 9.0 µg/m³2026-07-23: no data2026-07-24: 47.4 µg/m³2026-07-25: no data2026-07-26: 25.9 µg/m³2026-07-27: 41.3 µg/m³2026-07-28: 28.4 µg/m³2026-07-29: 26.9 µg/m³2026-07-30: no data2026-07-31: no data2026-08-01: no data2026-08-02: no data2026-08-03: no data2026-08-04: 6.1 µg/m³2026-08-05: no data2026-08-06: no data2026-08-07: no data2026-08-08: no data2026-08-09: no data2026-08-10: no data2026-08-11: 20.8 µg/m³2026-08-12: 21.1 µg/m³2026-08-13: 22.2 µg/m³2026-08-14: 20.3 µg/m³2026-08-15: 20.8 µg/m³2026-08-16: 20.5 µg/m³2026-08-17: no data2026-08-18: no data2026-08-19: 26.6 µg/m³2026-08-20: 20.6 µg/m³2026-08-21: 21.6 µg/m³2026-08-22: 22.5 µg/m³2026-08-23: 21.3 µg/m³2026-08-24: 20.4 µg/m³2026-08-25: 20.2 µg/m³2026-08-26: no data2026-08-27: no data2026-08-28: no data2026-08-29: no data2026-08-30: no data2026-08-31: no data2026-09-01: no data2026-09-02: no data2026-09-03: no data2026-09-04: no data2026-09-05: no data2026-09-06: no data2026-09-07: no data2026-09-08: no data2026-09-09: no data2026-09-10: 32.2 µg/m³2026-09-11: 39.1 µg/m³2026-09-12: 20.0 µg/m³2026-09-13: no data2026-09-14: no data2026-09-15: no data2026-09-16: no data2026-09-17: 28.7 µg/m³2026-09-18: no data2026-09-19: no data2026-09-20: no data2026-09-21: no data2026-09-22: 42.4 µg/m³2026-09-23: 29.8 µg/m³2026-09-24: 37.6 µg/m³2026-09-25: no data2026-09-26: no data2026-09-27: no data2026-09-28: 30.5 µg/m³2026-09-29: no data2026-09-30: no data
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

226 of 237 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#1853OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 54.9 µg/m³JanFeb 2026: 32.6 µg/m³FebMar 2025: 26.3 µg/m³Mar 2026: 53.0 µg/m³MarApr 2025: 21.6 µg/m³Apr 2026: 36.8 µg/m³AprMay 2025: 16.5 µg/m³May 2026: 21.3 µg/m³MayJun 2026: 29.6 µg/m³JunJul 2025: 18.5 µg/m³Jul 2026: 79.5 µg/m³JulAug 2025: 17.8 µg/m³Aug 2026: 20.4 µg/m³AugSep 2025: 17.4 µg/m³SepOct 2025: 20.9 µg/m³OctNov 2025: 50.9 µg/m³NovDec 2025: 73.4 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

StationOperatorType
New DM Office, Arrah - BSPCBGODL-IndiaBihar State Pollution Control BoardReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in India

Dera Māndi 68.4Jīnd 65.7Gurugram 61.6Yamuna Nagar 60.3Jammu 54.6Noida 51.8Kaithal 51.7Bhiwadi 50.6Dādri 48.2Dhāruhera 47.8Jalandhar 45.4Faridabad 42.6

30-day averages, µg/m³. All of India →

Updated 2026-10-01 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.