SmogRank / Mexico / Hidalgo / Huichapan

Huichapan, month by month

Huichapan has a measured daily mean on 267 days since 1 May 2023. Its worst month was March 2025, at 65 US AQI (16.5 µg/m³), 820th of 2,862 cities on that month's world ranking. Its cleanest was September 2025, at 42 US AQI (7.5 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnone
2025too few days for a mean (a year needs 256)152 days measured
Jan6 daysFebnoneMar65#820Apr12 daysMay5 daysJun3 daysJul52#1,361Aug48#1,605Sep42#1,479Oct8 daysNovnoneDec13 days
2024too few days for a mean (a year needs 257)8 days measured
JannoneFebnoneMarnoneAprnoneMay2 daysJunnoneJul3 daysAugnoneSep1 dayOct2 daysNovnoneDecnone
2023too few days for a mean (a year needs 256)107 days measured
JanFebMarAprMay3 daysJun6 daysJul17 daysAug63#189Sep2 daysOct8 daysNov51#819Dec19 days
Each square is a month's mean PM2.5 in US AQI from Huichapan'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 Huichapan 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

36 months
MonthWhy
Oct 2026No day measured.
Sep 2026No day measured.
Aug 2026No day measured.
Jul 2026No day measured.
Jun 2026No day measured.
May 2026No day measured.
Apr 2026No day measured.
Mar 2026No day measured.
Feb 2026No day measured.
Jan 2026No day measured.
Dec 202513 of 31 days measured; a month needs 22. The others: 14 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours).
Nov 2025No day measured. The others: 30 with no readings from the monitor.
Oct 20258 of 31 days measured; a month needs 22. The others: 21 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Jun 20253 of 30 days measured; a month needs 21. The others: 19 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours).
May 20255 of 31 days measured; a month needs 22. The others: 20 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks.
Apr 202512 of 30 days measured; a month needs 21. The others: 16 with no readings from the monitor, 2 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 20256 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), 2 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 29 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Nov 2024No day measured. The others: 30 with no readings from the monitor.
Oct 20242 of 31 days measured; a month needs 22. The others: 28 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Sep 20241 of 30 days measured; a month needs 21. The others: 28 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Aug 2024No day measured. The others: 31 with no readings from the monitor.
Jul 20243 of 31 days measured; a month needs 22. The others: 26 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Jun 2024No day measured. The others: 30 with no readings from the monitor.
May 20242 of 31 days measured; a month needs 22. The others: 26 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours).
Apr 2024No day measured. The others: 29 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Mar 2024No day measured. The others: 31 with no readings from the monitor.
Feb 2024No day measured. The others: 27 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive.
Jan 2024No day measured. The others: 31 with no readings from the monitor.
Dec 202319 of 31 days measured; a month needs 22. The others: 11 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Oct 20238 of 31 days measured; a month needs 22. The others: 17 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Sep 20232 of 30 days measured; a month needs 21. The others: 27 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jul 202317 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 3 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: 18 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
May 20233 of 31 days measured; a month needs 22. The others: 27 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).

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

Huichapan's worst months

MonthUS AQIDays measuredWorld rank
March 2025 6516.5 µg/m³23 of 31820thof 2,862
August 2023 6315.3 µg/m³22 of 31189thof 1,980
July 2025 529.6 µg/m³27 of 311,361stof 2,889
November 2023 519.2 µg/m³30 of 30819thof 2,243
August 2025 488.6 µg/m³27 of 311,605thof 2,901
September 2025 427.5 µg/m³28 of 301,479thof 3,104

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.

Huichapan's worst days

DayUS AQI
18 Jul 2024 13248.1 µg/m³
22 Dec 2025 12344.5 µg/m³
19 Dec 2025 11741.8 µg/m³
20 Dec 2025 11541.2 µg/m³
26 Mar 2025 11340.5 µg/m³
20 Mar 2025 11340.2 µg/m³
2 May 2025 10135.6 µg/m³
21 Dec 2025 10135.5 µg/m³
17 Jun 2023 9532.6 µg/m³
5 Jul 2023 9230.9 µg/m³

Daily means, the highest since 1 May 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, Huichapan, Mexico, 1 May 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/huichapan/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.

Huichapan 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).