SmogRank / United States / Texas / San Antonio
San Antonio, month by month
San Antonio has a measured daily mean on 1,205 days since 1 January 2023. Its worst month was May 2024, at 68 US AQI (18.2 µg/m³), 188th of 2,684 cities on that month's world ranking. Its cleanest was September 2024, at 36 US AQI (6.5 µg/m³). 2025 averaged 51 US AQI (9.3 µg/m³), against 53 US AQI (10.2 µg/m³) in 2024.
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
5 months
| Month | Why |
|---|---|
| Aug 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 8 of 31 days measured; a month needs 22. The others: 23 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 | 1 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 6 of 31 days measured; a month needs 22. The others: 7 missing from OpenAQ's archive, 18 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.
San Antonio's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| May 2024 | 6818.2 µg/m³ | 188thof 2,684 | Southern United States and Mexico, 19 to 28 May 2024 Southern United States and Mexico, 7 to 10 May 2024 |
| July 2026 | 6013.7 µg/m³ | 632ndof 2,784 | – |
| July 2023 | 5812.7 µg/m³ | 316thof 1,432 | – |
| June 2023 | 5812.6 µg/m³ | 509thof 1,603 | Southern United States and Mexico, June 2023 |
| May 2023 | 5712.2 µg/m³ | 252ndof 1,600 | – |
| April 2024 | 5712.2 µg/m³ | 689thof 2,520 | – |
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.
San Antonio's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2024 | 204129.0 µg/m³ | Texas, Louisiana and Mississippi, United States, January 2024 |
| 1 Jan 2023 | 16879.1 µg/m³ | – |
| 1 Jan 2026 | 16271.0 µg/m³ | Texas and Louisiana, United States, December 2025 to January 2026 |
| 31 Dec 2023 | 15460.2 µg/m³ | – |
| 7 Jan 2023 | 10336.3 µg/m³ | – |
| 19 Feb 2026 | 9633.5 µg/m³ | Southern United States and Mexico, February 2026 |
| 27 May 2024 | 9633.2 µg/m³ | Southern United States and Mexico, 19 to 28 May 2024 |
| 8 May 2024 | 9432.2 µg/m³ | Southern United States and Mexico, 7 to 10 May 2024 |
| 24 May 2024 | 9331.6 µg/m³ | Southern United States and Mexico, 19 to 28 May 2024 |
| 26 May 2024 | 9230.9 µg/m³ | Southern United States and Mexico, 19 to 28 May 2024 |
Daily means, the highest since 1 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, San Antonio, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/san-antonio/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.
San Antonio 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).