SmogRank / Mexico / Morelos / Zacatepec de Hidalgo

Zacatepec de Hidalgo, month by month

Zacatepec de Hidalgo has a measured daily mean on 639 days since 16 January 2023. Its worst month was February 2026, at 94 US AQI (32.1 µg/m³), 227th of 2,866 cities on that month's world ranking. Its cleanest was July 2025, at 27 US AQI (4.9 µg/m³).

Every month since 2023

202667 so far277 days measured425th of 2,793 in the world
Jan87#194Feb94#227Mar80#444Apr75#364May68#323Jun48#909Jul60#620Aug54#755Sep44#990Oct31#2,003
202563 for the year262 days measured395th of 2,681 in the world
JannoneFebnoneMar18 daysApr81#227May61#432Jun20 daysJul27#2,632Aug42#1,940Sep49#918Oct58#407Nov80#303Dec85#335
2024too few days for a mean (a year needs 257)27 days measured
Jan15 daysFebnoneMarnoneApr2 daysMay4 daysJun5 daysJulnoneAug1 daySepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)73 days measured
Jan13 daysFebnoneMarnoneAprnoneMay2 daysJun2 daysJul3 daysAug10 daysSepnoneOct6 daysNov17 daysDec20 days
Each square is a month's mean PM2.5 in US AQI from Zacatepec de Hidalgo'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 Zacatepec de Hidalgo 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

28 months
MonthWhy
Jun 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 202518 of 31 days measured; a month needs 22. The others: 13 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 2025No day measured. The others: 31 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 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20241 of 31 days measured; a month needs 22. The others: 30 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 20245 of 30 days measured; a month needs 21. The others: 25 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 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2024No day measured. The others: 1 missing from OpenAQ's archive, 28 with under 18 hours of readings or readings that failed our checks.
Jan 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Dec 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Nov 202317 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Oct 20236 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Sep 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202310 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jul 20233 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks.
Jun 20232 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 20232 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Apr 2023No day measured. The others: 3 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks.
Mar 2023No day measured. The others: 20 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks.
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 202313 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 2 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.

Zacatepec de Hidalgo's worst months

MonthUS AQIDays measuredWorld rank
February 2026 9432.1 µg/m³24 of 28227thof 2,866
January 2026 8728.3 µg/m³31 of 31194thof 2,617
December 2025 8527.5 µg/m³31 of 31335thof 3,006
April 2025 8125.1 µg/m³23 of 30227thof 2,951
November 2025 8024.6 µg/m³30 of 30303rdof 2,715
March 2026 8024.5 µg/m³31 of 31444thof 2,971

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.

Zacatepec de Hidalgo's worst days

DayUS AQI
26 Apr 2024 15357.9 µg/m³
25 Apr 2024 14754.3 µg/m³
22 Dec 2023 13649.8 µg/m³
21 Dec 2023 13549.5 µg/m³
10 Feb 2026 13348.3 µg/m³
6 Jan 2026 13147.5 µg/m³
14 Dec 2025 12947.0 µg/m³
7 Jan 2026 12846.3 µg/m³
11 Feb 2026 12645.7 µg/m³
14 Apr 2025 12645.5 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, Zacatepec de Hidalgo, Mexico, 16 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/zacatepec-de-hidalgo/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.

Zacatepec de Hidalgo 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).