SmogRank / Mexico / México / Santiaguito Tlalcilalcalli

Santiaguito Tlalcilalcalli, month by month

Santiaguito Tlalcilalcalli has a measured daily mean on 436 days since 16 January 2023. Its worst month was November 2025, at 93 US AQI (31.9 µg/m³), 244th of 2,715 cities on that month's world ranking. Its cleanest was August 2023, at 78 US AQI (23.5 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)75 days measured
JannoneFeb10 daysMar21 daysApr11 daysMaynoneJunnoneJulnoneAug12 daysSep13 daysOct71#107
2025too few days for a mean (a year needs 256)157 days measured
Jan6 daysFeb7 daysMar17 daysAprnoneMaynoneJun3 daysJul83#125Aug21 daysSep12 daysOct21 daysNov93#244Dec21 days
2024too few days for a mean (a year needs 257)18 days measured
Jan12 daysFeb2 daysMar1 dayApr2 daysMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDec1 day
2023too few days for a mean (a year needs 256)186 days measured
Jan10 daysFebnoneMar11 daysApr88#54May4 daysJun4 daysJul11 daysAug78#92Sep84#51Oct17 daysNov82#43Dec93#60
Each square is a month's mean PM2.5 in US AQI from Santiaguito Tlalcilalcalli'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 Santiaguito Tlalcilalcalli marked; each year, the year's. A dashed square is the running month, so far.
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

38 months
MonthWhy
Sep 202613 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Aug 202612 of 31 days measured; a month needs 22. The others: 19 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 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 202611 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Mar 202621 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Feb 202610 of 28 days measured; a month needs 20. The others: 18 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.
Dec 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Sep 202512 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Aug 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jun 20253 of 30 days measured; a month needs 21. The others: 27 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 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Feb 20257 of 28 days measured; a month needs 20. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jan 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Dec 20241 of 31 days measured; a month needs 22. The others: 30 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 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 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 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 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 20242 of 29 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jan 202412 of 31 days measured; a month needs 22. The others: 19 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 20234 of 31 days measured; a month needs 22. The others: 27 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 2023No day measured. The others: 25 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Jan 202310 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 5 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.

Santiaguito Tlalcilalcalli's worst months

MonthUS AQIDays measuredWorld rankEpisode
November 2025 9331.9 µg/m³21 of 30244thof 2,715–
December 2023 9331.4 µg/m³27 of 3160thof 2,247Southern Mexico, December 2023
April 2023 8829.2 µg/m³25 of 3054thof 1,622–
September 2023 8426.6 µg/m³25 of 3051stof 2,176–
July 2025 8326.2 µg/m³28 of 31125thof 2,889–
November 2023 8225.8 µg/m³30 of 3043rdof 2,243–

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.

Santiaguito Tlalcilalcalli's worst days

DayUS AQIEpisode
25 Dec 2023 218143.0 µg/m³Southern Mexico, December 2023
28 Mar 2024 15358.4 µg/m³–
20 Jan 2023 15156.2 µg/m³Southern Mexico, January 2023
21 Jan 2023 15155.7 µg/m³Southern Mexico, January 2023
17 Jan 2023 14854.5 µg/m³–
18 Jan 2023 14453.0 µg/m³–
19 Jan 2023 14352.6 µg/m³Southern Mexico, January 2023
25 Mar 2023 14051.5 µg/m³–
16 Jan 2023 13951.0 µg/m³–
26 Jan 2023 13348.3 µg/m³–

Daily means, the highest since 16 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, Santiaguito Tlalcilalcalli, Mexico, 16 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/santiaguito-tlalcilalcalli/history (accessed 12 Oct 2026).

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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.

Santiaguito Tlalcilalcalli now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 19:07 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).