SmogRank / Mexico / Guanajuato / Silao de la Victoria

Silao de la Victoria, month by month

Silao de la Victoria has a measured daily mean on 733 days since 15 April 2023. Its worst month was December 2024, at 86 US AQI (27.7 µg/m³), 116th of 2,616 cities on that month's world ranking. Its cleanest was April 2024, at 51 US AQI (9.2 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)164 days measured
Jan80#259Feb17 daysMar12 daysApr75#366MaynoneJun5 daysJul67#395Aug68#287Sep19 daysOct4 days
2025too few days for a mean (a year needs 256)210 days measured
Jan78#202Feb16 daysMar5 daysApr70#368May18 daysJun15 daysJul54#1,097Aug17 daysSepnoneOct12 daysNov18 daysDec75#446
2024too few days for a mean (a year needs 257)214 days measured
Jan75#226Feb68#238Mar71#167Apr51#1,132May19 daysJun12 daysJulnoneAugnoneSepnoneOct66#191Nov84#82Dec86#116
2023too few days for a mean (a year needs 256)145 days measured
JanFebMarApr13 daysMay81#76Jun8 daysJul3 daysAug9 daysSep7 daysOct55#241Nov19 daysDec67#209
Each square is a month's mean PM2.5 in US AQI from Silao de la Victoria'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 Silao de la Victoria 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

25 months
MonthWhy
Oct 20264 of 11 days measured; a month needs 8. The others: 1 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours).
Sep 202619 of 30 days measured; a month needs 21. The others: 11 with readings for part of the day (a day needs 18 hours).
Jun 20265 of 30 days measured; a month needs 21. The others: 25 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.
Mar 202612 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Feb 202617 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Nov 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Oct 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jun 202515 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks.
May 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Feb 202516 of 28 days measured; a month needs 20. The others: 12 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 202412 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 202419 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Nov 202319 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Sep 20237 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
Aug 20239 of 31 days measured; a month needs 22. The others: 22 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 20238 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks.
Apr 202313 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive.

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

Silao de la Victoria's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2024 8627.7 µg/m³29 of 31116thof 2,616Guanajuato, México and Mexico City, Mexico, December 2024
November 2024 8426.7 µg/m³28 of 3082ndof 2,624–
May 2023 8125.2 µg/m³29 of 3176thof 1,600Guanajuato and Jalisco, Mexico, May 2023
January 2026 8024.6 µg/m³24 of 31259thof 2,617Southern Mexico, January 2026
January 2025 7823.6 µg/m³29 of 31202ndof 2,474–
January 2024 7522.0 µg/m³31 of 31226thof 2,385Southern Mexico, January 2024

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.

Silao de la Victoria's worst days

DayUS AQIEpisode
1 Jan 2024 18198.6 µg/m³Southern Mexico, January 2024
1 Jan 2026 16777.9 µg/m³Southern Mexico, January 2026
25 Dec 2024 15662.9 µg/m³Guanajuato, México and Mexico City, Mexico, December 2024
25 Dec 2023 13047.3 µg/m³Southern Mexico, December 2023
10 Feb 2025 12746.2 µg/m³–
5 May 2023 12344.4 µg/m³Guanajuato and Jalisco, Mexico, May 2023
4 May 2023 12143.7 µg/m³Guanajuato and Jalisco, Mexico, May 2023
13 Dec 2024 12043.4 µg/m³–
2 Dec 2024 12043.2 µg/m³–
23 Apr 2023 12043.1 µg/m³–

Daily means, the highest since 15 Apr 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, Silao de la Victoria, Mexico, 15 Apr 2023 – 10 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/silao-de-la-victoria/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.

Silao de la Victoria 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).