SmogRank / Mexico / Hidalgo / Pachuca de Soto

Pachuca de Soto, month by month

Pachuca de Soto has a measured daily mean on 661 days since 10 January 2023. Its worst month was May 2026, at 77 US AQI (22.8 µg/m³), 243rd of 2,874 cities on that month's world ranking. Its cleanest was September 2025, at 33 US AQI (6.0 µg/m³).

Every month since 2023

202664 so far219 days measured492nd of 2,791 in the world
Jan5 daysFeb73#526Mar72#595Apr63#548May77#243Jun56#516Jul66#423Aug62#390Sep49#803Oct42#1,133
202554 for the year259 days measured747th of 2,681 in the world
Jan4 daysFeb2 daysMar20 daysApr65#486May70#294Jun39#2,020Jul48#1,614Aug39#2,132Sep33#2,096Oct42#989Nov55#824Dec1 day
2024too few days for a mean (a year needs 257)21 days measured
Jan1 dayFebnoneMar3 daysApr8 daysMay4 daysJun3 daysJul1 dayAug1 daySepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)162 days measured
Jan13 daysFeb2 daysMar11 daysApr70#124May5 daysJun5 daysJul14 daysAug52#652Sep43#1,233Oct13 daysNov18 daysDec2 days
Each square is a month's mean PM2.5 in US AQI from Pachuca de Soto'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 Pachuca de Soto 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

26 months
MonthWhy
Jan 20265 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Dec 20251 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Feb 20252 of 28 days measured; a month needs 20. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jan 20254 of 31 days measured; a month needs 22. The others: 27 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 20241 of 31 days measured; a month needs 22. The others: 30 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 20248 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks.
Mar 20243 of 31 days measured; a month needs 22. The others: 28 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 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Dec 20232 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Nov 202318 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 202313 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 202314 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 16 with under 18 hours of readings or readings that failed our checks.
Jun 20235 of 30 days measured; a month needs 21. The others: 25 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.
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 202313 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 3 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.

Pachuca de Soto's worst months

MonthUS AQIDays measuredWorld rank
May 2026 7722.8 µg/m³30 of 31243rdof 2,874
February 2026 7320.8 µg/m³20 of 28526thof 2,866
March 2026 7220.3 µg/m³28 of 31595thof 2,971
April 2023 7019.1 µg/m³25 of 30124thof 1,622
May 2025 7019.1 µg/m³25 of 31294thof 2,826
July 2026 6616.9 µg/m³26 of 31423rdof 2,784

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.

Pachuca de Soto's worst days

DayUS AQIEpisode
29 May 2026 205130.0 µg/m³–
2 Jun 2026 17893.9 µg/m³–
11 Apr 2026 15663.0 µg/m³–
30 May 2026 13348.4 µg/m³–
6 Mar 2026 13047.3 µg/m³–
6 Jun 2024 11340.4 µg/m³Southern Mexico, June 2024
9 May 2024 11240.0 µg/m³–
29 Apr 2023 10135.7 µg/m³–
20 Mar 2025 10135.5 µg/m³–
20 May 2025 9733.6 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, Pachuca de Soto, Mexico, 10 Jan 2023 – 10 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/pachuca-de-soto/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.

Pachuca de Soto 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).