SmogRank / India / Bihar / Sasarām

Sasarām, month by month

Sasarām has a measured daily mean on 313 days since 19 February 2025. Its worst month was April 2025, at 167 US AQI (78.0 µg/m³), 7th of 2,951 cities on that month's world ranking. Its cleanest was March 2026, at 86 US AQI (27.9 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 200)116 days measured
Jan16 daysFeb17 daysMar86#335Apr10 daysMay10 daysJunnoneJul1 dayAug11 daysSep92#118Oct6 days
2025too few days for a mean (a year needs 256)197 days measured
JanFeb6 daysMar166#18Apr167#7May17 daysJun17 daysJul8 daysAug20 daysSep9 daysOct18 daysNov102#224Dec134#205
Each square is a month's mean PM2.5 in US AQI from Sasarām's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Sasarām marked; each year, the year's.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Months without a mean, and why

15 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Aug 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jul 20261 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Apr 202610 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Feb 202617 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 202616 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Oct 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Sep 20259 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Aug 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Jun 202517 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
May 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Feb 20256 of 28 days measured; a month needs 20. The others: 4 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Sasarām's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2025 16778.0 µg/m³22 of 307thof 2,951North-eastern India, April 2025
Northern India, March and April 2025
March 2025 16676.2 µg/m³30 of 3118thof 2,862Northern India, March and April 2025
India, March 2025
December 2025 13449.0 µg/m³27 of 31205thof 3,006–
November 2025 10236.1 µg/m³23 of 30224thof 2,715–
September 2026 9230.9 µg/m³22 of 30118thof 2,981Eastern India, 28 September to 1 October 2026
North-eastern India and Bhutan, September 2026
March 2026 8627.9 µg/m³23 of 31335thof 2,971–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Sasarām's worst days

DayUS AQIEpisode
22 Aug 2026 283208.0 µg/m³Bihar, Odisha and Uttar Pradesh, India, August 2026
21 Aug 2026 220145.0 µg/m³Bihar, Odisha and Uttar Pradesh, India, August 2026
10 Mar 2025 197121.0 µg/m³–
22 Apr 2025 196120.0 µg/m³North-eastern India, April 2025
12 Dec 2025 189109.0 µg/m³–
11 Mar 2025 188108.0 µg/m³India, March 2025
28 Feb 2025 187107.0 µg/m³–
23 Apr 2025 187107.0 µg/m³North-eastern India, April 2025
22 Feb 2025 186106.0 µg/m³Bihar, India, February 2025
5 Mar 2025 186106.0 µg/m³–

Daily means, the highest since 19 Feb 2025; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Sasarām, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/sasaram/history (accessed 12 Oct 2026).

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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.

Sasarām now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).