SmogRank / Mexico / Puebla / Tehuacán
Tehuacán, month by month
Tehuacán has a measured daily mean on 616 days since 25 August 2023. Its worst month was April 2025, at 85 US AQI (27.4 µg/m³), 198th of 2,951 cities on that month's world ranking. Its cleanest was September 2025, at 51 US AQI (9.1 µg/m³).
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
21 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 11 days measured; a month needs 8. The others: 3 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 19 of 30 days measured; a month needs 21. The others: 4 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours). |
| Nov 2025 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 1 of 30 days measured; a month needs 21. The others: 29 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 | 4 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Feb 2024 | 1 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks. |
| Jan 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 12 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 14 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 7 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Tehuacán's worst months
| Month | US AQI | World rank |
|---|---|---|
| April 2025 | 8527.4 µg/m³ | 198thof 2,951 |
| May 2025 | 7924.3 µg/m³ | 203rdof 2,826 |
| March 2025 | 7522.2 µg/m³ | 491stof 2,862 |
| February 2026 | 7522.0 µg/m³ | 480thof 2,866 |
| May 2026 | 7019.2 µg/m³ | 299thof 2,874 |
| March 2026 | 6919.0 µg/m³ | 632ndof 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.
Tehuacán's worst days
| Day | US AQI | Episode |
|---|---|---|
| 6 Jun 2024 | 15662.5 µg/m³ | Southern Mexico, June 2024 |
| 20 Apr 2025 | 15358.4 µg/m³ | – |
| 7 Jun 2024 | 15155.8 µg/m³ | Southern Mexico, June 2024 |
| 1 Jan 2024 | 13750.3 µg/m³ | Southern Mexico, January 2024 |
| 21 Apr 2025 | 12545.3 µg/m³ | – |
| 1 Jan 2026 | 12143.7 µg/m³ | Southern Mexico, January 2026 |
| 2 May 2025 | 11641.4 µg/m³ | – |
| 8 Mar 2026 | 11440.8 µg/m³ | – |
| 30 Apr 2024 | 11239.9 µg/m³ | – |
| 22 Apr 2025 | 10738.1 µg/m³ | – |
Daily means, the highest since 25 Aug 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, Tehuacán, Mexico, 25 Aug 2023 – 7 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/tehuacan/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.
Tehuacán 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).