SmogRank / Episodes / Mexico

Hidalgo and Puebla, Mexico, November 2025

For 2 days, from 20 to 21 November 2025, 9 cities in Mexico had PM2.5 at least twice their usual for the time of year. The worst reading was Cholula, Puebla, Mexico: 87.6 µg/m³ on 21 November, about 3.2× its usual 27.6.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days220 to 21 November 2025
Worst day21 November7 cities counted
Furthest above usual3.2×Cholula

Day by day

21 November 7 cities at twice their usual or more
Ciudad NezahualcoyotlMexico CityNaucalpan de JuárezSan Martin Texmelucan de LabastidaYecapixtlaXonacatlánSan Salvador TizatlalliAtlixcoSan Francisco TlalcilalcalpanZacatepec de HidalgoCelayaMoreliaSan Miguel de AllendeSan Luis de la PazSalamancaIrapuatoAbasoloGuanajuatoSilao de la VictoriaLeón de los AldamaAguascalientesPueblaTulancingoMixquiahuala de JuárezTula de AllendeSan Juan del RíoTehuacánSantiago de QuerétaroPachuca de SotoCholula
17 Nov18192021222324
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

CholulaCholula, 17 November: 58.8 µg/m³, 2.1× usualCholula, 18 November: 94.4 µg/m³, 3.4× usualCholula, 19 November: 73.1 µg/m³, 2.6× usualCholula, 20 November: 84.2 µg/m³, 3.1× usualCholula, 21 November: 87.6 µg/m³, 3.2× usualCholula, 22 November: no readingCholula, 23 November: no readingCholula, 24 November: no readingSantiago de Queréta…Santiago de Querétaro, 17 November: 25.1 µg/m³, 2.1× usualSantiago de Querétaro, 18 November: 32.4 µg/m³, 2.7× usualSantiago de Querétaro, 19 November: 24.6 µg/m³, 2.0× usualSantiago de Querétaro, 20 November: 30.6 µg/m³, 2.5× usualSantiago de Querétaro, 21 November: 35.3 µg/m³, 2.9× usualSantiago de Querétaro, 22 November: 22.2 µg/m³, 1.8× usualSantiago de Querétaro, 23 November: 17.1 µg/m³, 1.4× usualSantiago de Querétaro, 24 November: 25.9 µg/m³, 2.1× usualTulancingoTulancingo, 17 November: 8.3 µg/m³, 0.6× usualTulancingo, 18 November: 12.1 µg/m³, 0.9× usualTulancingo, 19 November: 16.2 µg/m³, 1.2× usualTulancingo, 20 November: 30.0 µg/m³, 2.2× usualTulancingo, 21 November: 26.7 µg/m³, 2.0× usualTulancingo, 22 November: 25.9 µg/m³, 1.9× usualTulancingo, 23 November: 20.3 µg/m³, 1.5× usualTulancingo, 24 November: 17.7 µg/m³, 1.3× usualTehuacánTehuacán, 17 November: 23.6 µg/m³, 2.2× usualTehuacán, 18 November: 21.1 µg/m³, 2.0× usualTehuacán, 19 November: 23.1 µg/m³, 2.1× usualTehuacán, 20 November: 26.1 µg/m³, 2.4× usualTehuacán, 21 November: 26.4 µg/m³, 2.4× usualTehuacán, 22 November: 22.0 µg/m³, 2.0× usualTehuacán, 23 November: no readingTehuacán, 24 November: no readingPachuca de SotoPachuca de Soto, 17 November: 10.2 µg/m³, 1.2× usualPachuca de Soto, 18 November: 10.3 µg/m³, 1.2× usualPachuca de Soto, 19 November: 11.1 µg/m³, 1.3× usualPachuca de Soto, 20 November: 25.8 µg/m³, 3.1× usualPachuca de Soto, 21 November: 23.8 µg/m³, 2.9× usualPachuca de Soto, 22 November: 18.9 µg/m³, 2.3× usualPachuca de Soto, 23 November: 10.2 µg/m³, 1.2× usualPachuca de Soto, 24 November: 18.6 µg/m³, 2.2× usualPueblaPuebla, 17 November: 30.6 µg/m³, 1.8× usualPuebla, 18 November: 28.1 µg/m³, 1.7× usualPuebla, 19 November: 25.8 µg/m³, 1.5× usualPuebla, 20 November: 30.7 µg/m³, 1.8× usualPuebla, 21 November: 37.3 µg/m³, 2.2× usualPuebla, 22 November: 26.8 µg/m³, 1.6× usualPuebla, 23 November: 24.4 µg/m³, 1.5× usualPuebla, 24 November: 25.9 µg/m³, 1.6× usualMixquiahuala de Juá…Mixquiahuala de Juárez, 17 November: 17.3 µg/m³, 1.1× usualMixquiahuala de Juárez, 18 November: 22.8 µg/m³, 1.5× usualMixquiahuala de Juárez, 19 November: 20.0 µg/m³, 1.3× usualMixquiahuala de Juárez, 20 November: 30.8 µg/m³, 2.0× usualMixquiahuala de Juárez, 21 November: 36.6 µg/m³, 2.3× usualMixquiahuala de Juárez, 22 November: 30.2 µg/m³, 1.9× usualMixquiahuala de Juárez, 23 November: 20.9 µg/m³, 1.3× usualMixquiahuala de Juárez, 24 November: no readingTula de AllendeTula de Allende, 17 November: 16.0 µg/m³, 1.2× usualTula de Allende, 18 November: 20.1 µg/m³, 1.5× usualTula de Allende, 19 November: 22.5 µg/m³, 1.7× usualTula de Allende, 20 November: 24.0 µg/m³, 1.8× usualTula de Allende, 21 November: 29.8 µg/m³, 2.3× usualTula de Allende, 22 November: no readingTula de Allende, 23 November: no readingTula de Allende, 24 November: no readingSan Juan del RíoSan Juan del Río, 17 November: 16.5 µg/m³, 1.6× usualSan Juan del Río, 18 November: 18.1 µg/m³, 1.7× usualSan Juan del Río, 19 November: 16.6 µg/m³, 1.6× usualSan Juan del Río, 20 November: 22.4 µg/m³, 2.1× usualSan Juan del Río, 21 November: 25.2 µg/m³, 2.4× usualSan Juan del Río, 22 November: 20.8 µg/m³, 2.0× usualSan Juan del Río, 23 November: 15.8 µg/m³, 1.5× usualSan Juan del Río, 24 November: 22.7 µg/m³, 2.1× usual17 Nov18192021222324
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
CholulaPuebla, Mexico2 94.418 November27.63.4×
Pachuca de SotoHidalgo, Mexico1 25.820 November8.33.1×
Santiago de QuerétaroQuerétaro, Mexico2 35.321 November12.22.9×
TehuacánPuebla, Mexico2 26.421 November10.82.4×
San Juan del RíoQuerétaro, Mexico1 25.221 November10.62.4×
Mixquiahuala de JuárezHidalgo, Mexico1 36.621 November15.72.3×
Tula de AllendeHidalgo, Mexico1 29.821 November13.12.3×
TulancingoHidalgo, Mexico1 30.020 November13.42.2×
PueblaPuebla, Mexico1 37.321 November16.72.2×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in Mexico

Number 8 of 12 episodes in Mexico since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading.

Use this page

SmogRank, Hidalgo and Puebla, Mexico, November 2025: 9 cities with PM2.5 at twice their usual or more, 20 to 21 November 2025, smogrank.com/episodes/2025-11-hidalgo-and-puebla-mexico (accessed 2 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.