SmogRank / Mexico / Hidalgo / Atotonilco de Tula

Atotonilco de Tula, month by month

Atotonilco de Tula has a measured daily mean on 625 days since 10 January 2023. Its worst month was April 2023, at 87 US AQI (28.5 µg/m³), 57th of 1,622 cities on that month's world ranking. Its cleanest was September 2026, at 62 US AQI (15.1 µg/m³).

Every month since 2023

202669 so far215 days measured385th of 2,793 in the world
Jan8 daysFeb1 dayMar74#553Apr73#388May79#226Jun64#306Jul76#258Aug65#341Sep62#367Oct51#726
2025too few days for a mean (a year needs 256)207 days measured
Jan1 dayFebnoneMar17 daysApr81#227May81#196Jun71#232Jul75#166Aug68#232Sep64#306Oct5 daysNov5 daysDec12 days
2024too few days for a mean (a year needs 257)15 days measured
Jan15 daysFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)188 days measured
Jan12 daysFeb2 daysMar11 daysApr87#57May6 daysJun6 daysJul19 daysAug64#171Sep19 daysOct15 daysNov19 daysDec66#216
Each square is a month's mean PM2.5 in US AQI from Atotonilco de Tula'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 Atotonilco de Tula 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

29 months
MonthWhy
Feb 20261 of 28 days measured; a month needs 20. The others: 22 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
Jan 20268 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours).
Dec 202512 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours).
Nov 20255 of 30 days measured; a month needs 21. The others: 20 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
Oct 20255 of 31 days measured; a month needs 22. The others: 25 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Mar 202517 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours).
Feb 2025No day measured. The others: 28 with no readings from the monitor.
Jan 20251 of 31 days measured; a month needs 22. The others: 5 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours), 21 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with no readings from the monitor.
Nov 2024No day measured. The others: 30 with no readings from the monitor.
Oct 2024No day measured. The others: 31 with no readings from the monitor.
Sep 2024No day measured. The others: 30 with no readings from the monitor.
Aug 2024No day measured. The others: 31 with no readings from the monitor.
Jul 2024No day measured. The others: 31 with no readings from the monitor.
Jun 2024No day measured. The others: 30 with no readings from the monitor.
May 2024No day measured. The others: 31 with no readings from the monitor.
Apr 2024No day measured. The others: 30 with no readings from the monitor.
Mar 2024No day measured. The others: 31 with no readings from the monitor.
Feb 2024No day measured. The others: 28 with no readings from the monitor, 1 missing from OpenAQ's archive.
Jan 202415 of 31 days measured; a month needs 22. The others: 15 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Nov 202319 of 30 days measured; a month needs 21. The others: 9 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Oct 202315 of 31 days measured; a month needs 22. The others: 15 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Sep 202319 of 30 days measured; a month needs 21. The others: 2 with no readings from the monitor, 9 with readings for part of the day (a day needs 18 hours).
Jul 202319 of 31 days measured; a month needs 22. The others: 6 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive.
Jun 20236 of 30 days measured; a month needs 21. The others: 12 with no readings from the monitor, 12 with readings for part of the day (a day needs 18 hours).
May 20236 of 31 days measured; a month needs 22. The others: 21 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours).
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: 1 with no readings from the monitor, 25 missing from OpenAQ's archive.
Jan 202312 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours), 6 missing from OpenAQ's archive.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Atotonilco de Tula's worst months

MonthUS AQIDays measuredWorld rank
April 2023 8728.5 µg/m³27 of 3057thof 1,622
April 2025 8125.1 µg/m³28 of 30227thof 2,951
May 2025 8125.0 µg/m³31 of 31196thof 2,826
May 2026 7924.2 µg/m³31 of 31226thof 2,874
July 2026 7622.7 µg/m³30 of 31258thof 2,784
July 2025 7522.1 µg/m³27 of 31166thof 2,889

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.

Atotonilco de Tula's worst days

DayUS AQIEpisode
11 Nov 2023 16169.5 µg/m³–
15 Nov 2023 16169.5 µg/m³–
16 Nov 2023 15763.5 µg/m³–
14 Nov 2023 14653.9 µg/m³–
1 Jan 2024 13850.7 µg/m³Southern Mexico, January 2024
20 Jan 2023 13750.2 µg/m³Southern Mexico, January 2023
22 Jun 2025 13047.1 µg/m³–
6 Apr 2023 12445.0 µg/m³–
17 Jun 2023 12143.7 µg/m³Southern Mexico, June 2023
4 Jun 2025 12043.4 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, Atotonilco de Tula, Mexico, 10 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/atotonilco-de-tula/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.

Atotonilco de Tula now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 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).