SmogRank / Mexico / Guanajuato / Irapuato
Irapuato, month by month
Irapuato has a measured daily mean on 1,020 days since 2 January 2023. Its worst month was December 2024, at 86 US AQI (27.7 µg/m³), 116th of 2,616 cities on that month's world ranking. Its cleanest was September 2025, at 44 US AQI (8.0 µg/m³). 2025 averaged 67 US AQI (17.7 µg/m³), against 63 US AQI (15.8 µg/m³) in 2023.
Every month since 2023
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
17 months
| Month | Why |
|---|---|
| May 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 17 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 13 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 9 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
| Jan 2023 | 20 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 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.
Irapuato's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 8627.7 µg/m³ | 116thof 2,616 | Guanajuato, México and Mexico City, Mexico, December 2024 |
| May 2024 | 8326.2 µg/m³ | 82ndof 2,684 | – |
| March 2025 | 8225.5 µg/m³ | 419thof 2,862 | Southern Mexico, March 2025 |
| November 2024 | 8125.0 µg/m³ | 106thof 2,624 | – |
| April 2025 | 7823.6 µg/m³ | 259thof 2,951 | – |
| December 2025 | 7823.6 µg/m³ | 390thof 3,006 | – |
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.
Irapuato's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2026 | 194117.0 µg/m³ | Southern Mexico, January 2026 |
| 1 Jan 2024 | 185104.0 µg/m³ | Southern Mexico, January 2024 |
| 25 Dec 2024 | 16473.7 µg/m³ | Guanajuato, México and Mexico City, Mexico, December 2024 |
| 31 Dec 2024 | 15866.1 µg/m³ | – |
| 25 Dec 2023 | 15865.7 µg/m³ | Southern Mexico, December 2023 |
| 20 Mar 2025 | 15358.9 µg/m³ | Southern Mexico, March 2025 |
| 27 Jan 2025 | 13951.1 µg/m³ | – |
| 6 May 2025 | 13549.4 µg/m³ | – |
| 7 Jan 2026 | 12745.9 µg/m³ | Mexico, January 2026 |
| 7 Jun 2024 | 12444.8 µg/m³ | Southern Mexico, June 2024 |
Daily means, the highest since 2 Jan 2023; 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, Irapuato, Mexico, 2 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/irapuato/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.
Irapuato now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).