SmogRank / Mexico / México / San Antonio la Isla

San Antonio la Isla, month by month

San Antonio la Isla has a measured daily mean on 537 days since 10 January 2023. Its worst month was March 2025, at 101 US AQI (35.6 µg/m³), 214th of 2,862 cities on that month's world ranking. Its cleanest was September 2026, at 69 US AQI (19.0 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)119 days measured
JannoneFeb14 daysMar91#266Apr89#233May6 daysJunnoneJulnoneAug14 daysSep69#285Oct4 days
2025too few days for a mean (a year needs 256)206 days measured
Jan1 dayFebnoneMar101#214Apr1 dayMaynoneJun4 daysJul75#170Aug73#185Sep73#193Oct78#236Nov96#238Dec95#275
2024too few days for a mean (a year needs 257)36 days measured
Jan14 daysFeb5 daysMar1 dayApr2 daysMay4 daysJun3 daysJulnoneAug5 daysSep2 daysOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)176 days measured
Jan15 daysFeb2 daysMar11 daysApr5 daysMay5 daysJun4 daysJul11 daysAug74#112Sep80#63Oct17 daysNov80#50Dec85#75
Each square is a month's mean PM2.5 in US AQI from San Antonio la Isla'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 San Antonio la Isla 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

32 months
MonthWhy
Oct 20264 of 11 days measured; a month needs 8. The others: 3 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours).
Aug 202614 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 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 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Feb 202614 of 28 days measured; a month needs 20. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20254 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 20251 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20251 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Aug 20245 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20243 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
May 20244 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Apr 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Feb 20245 of 29 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jan 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Oct 202317 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jul 202311 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 19 with under 18 hours of readings or readings that failed our checks.
Jun 20234 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 20235 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Apr 20235 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 22 with under 18 hours of readings or readings that failed our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20232 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks.
Jan 202315 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 1 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 la Isla's worst months

MonthUS AQIDays measuredWorld rank
March 2025 10135.6 µg/m³23 of 31214thof 2,862
November 2025 9633.3 µg/m³30 of 30238thof 2,715
December 2025 9532.9 µg/m³31 of 31275thof 3,006
March 2026 9130.5 µg/m³28 of 31266thof 2,971
April 2026 8929.6 µg/m³30 of 30233rdof 2,941
December 2023 8527.6 µg/m³27 of 3175thof 2,247

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 la Isla's worst days

DayUS AQI
20 Feb 2026 16169.4 µg/m³
1 Apr 2024 15560.7 µg/m³
2 May 2024 15256.6 µg/m³
22 Mar 2025 15155.5 µg/m³
25 Dec 2025 14653.9 µg/m³
2 Apr 2024 14653.7 µg/m³
20 Mar 2025 14452.9 µg/m³
11 Mar 2026 13850.5 µg/m³
1 May 2024 13750.0 µg/m³
3 May 2023 13649.7 µg/m³

Daily means, the highest since 10 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 la Isla, Mexico, 10 Jan 2023 – 9 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/san-antonio-la-isla/history (accessed 12 Oct 2026).

Download chart (PNG)

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 la Isla 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).