SmogRank / India / Bihar / Gaya
Gaya, month by month
Gaya has a measured daily mean on 553 days since 19 February 2025. Its worst month was December 2025, at 157 US AQI (64.6 µg/m³), 126th of 3,006 cities on that month's world ranking. Its cleanest was August 2025, at 73 US AQI (20.8 µg/m³).
Every month since 2025
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
3 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitors, 1 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 10 of 28 days measured; a month needs 20. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Gaya's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2025 | 15764.6 µg/m³ | 126thof 3,006 | – |
| November 2025 | 15459.6 µg/m³ | 133rdof 2,715 | – |
| March 2025 | 13348.4 µg/m³ | 94thof 2,862 | – |
| March 2026 | 13248.1 µg/m³ | 92ndof 2,971 | – |
| April 2025 | 12946.8 µg/m³ | 53rdof 2,951 | North-eastern India, April 2025 |
| February 2026 | 12043.3 µg/m³ | 139thof 2,866 | – |
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.
Gaya's worst days
| Day | US AQI | Episode |
|---|---|---|
| 22 Jul 2025 | 189109.5 µg/m³ | Northern India, July 2025 |
| 10 Nov 2025 | 17996.1 µg/m³ | – |
| 12 Dec 2025 | 17996.0 µg/m³ | – |
| 11 Mar 2026 | 17893.9 µg/m³ | – |
| 20 Feb 2025 | 17893.4 µg/m³ | Bihar, India, February 2025 |
| 20 Oct 2025 | 17793.1 µg/m³ | India and Pakistan, October 2025 |
| 9 Dec 2025 | 17792.5 µg/m³ | – |
| 31 Jan 2026 | 17589.8 µg/m³ | – |
| 27 Feb 2025 | 17488.3 µg/m³ | – |
| 8 Dec 2025 | 17487.7 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, Gaya, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/gaya/history (accessed 12 Oct 2026).
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.
Gaya now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).