SmogRank / Episodes / Mexico
Southern Mexico, June 2024
For 2 days, from 6 to 7 June 2024, 16 cities in Mexico had PM2.5 at least twice their usual for the time of year. The worst reading was Tehuacán, Puebla, Mexico: 62.5 µg/m³ on 6 June, about 4.7× its usual 13.3.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 16 in 1 country
Days 2 6 to 7 June 2024
Worst day 7 June 16 cities counted
Furthest above usual 4.7× Tehuacán
Day by day
Play 7 June 16 cities at twice their usual or more
Celaya Toluca Salamanca Silao de la Victoria Yecapixtla Cholula Aguascalientes Tlaquepaque Zapopan León de los Aldama Abasolo Puebla Guanajuato San Luis de la Paz Santiago de Querétaro San Miguel de Allende Irapuato Guadalajara Cuernavaca Mixquiahuala de Juárez San Juan del Río Tula de Allende Zacatepec de Hidalgo Pachuca de Soto Tehuacán 3 Jun 4 5 6 7 8 9 10 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
Guadalajara Guadalajara, 3 June: no reading Guadalajara, 4 June: no reading Guadalajara, 5 June: 41.0 µg/m³, 2.6× usual Guadalajara, 6 June: 46.7 µg/m³, 3.0× usual Guadalajara, 7 June: 51.6 µg/m³, 3.3× usual Guadalajara, 8 June: no reading Guadalajara, 9 June: no reading Guadalajara, 10 June: 25.5 µg/m³, 1.6× usual San Juan del Río San Juan del Río, 3 June: 20.8 µg/m³, 1.7× usual San Juan del Río, 4 June: 19.2 µg/m³, 1.6× usual San Juan del Río, 5 June: 27.3 µg/m³, 2.3× usual San Juan del Río, 6 June: 29.7 µg/m³, 2.5× usual San Juan del Río, 7 June: 39.8 µg/m³, 3.3× usual San Juan del Río, 8 June: 26.8 µg/m³, 2.2× usual San Juan del Río, 9 June: no reading San Juan del Río, 10 June: no reading Tehuacán Tehuacán, 3 June: no reading Tehuacán, 4 June: no reading Tehuacán, 5 June: no reading Tehuacán, 6 June: 62.5 µg/m³, 4.7× usual Tehuacán, 7 June: 55.8 µg/m³, 4.2× usual Tehuacán, 8 June: no reading Tehuacán, 9 June: no reading Tehuacán, 10 June: no reading Mixquiahuala de Juá… Mixquiahuala de Juárez, 3 June: no reading Mixquiahuala de Juárez, 4 June: no reading Mixquiahuala de Juárez, 5 June: no reading Mixquiahuala de Juárez, 6 June: 45.8 µg/m³, 3.1× usual Mixquiahuala de Juárez, 7 June: 48.6 µg/m³, 3.3× usual Mixquiahuala de Juárez, 8 June: no reading Mixquiahuala de Juárez, 9 June: no reading Mixquiahuala de Juárez, 10 June: no reading Pachuca de Soto Pachuca de Soto, 3 June: no reading Pachuca de Soto, 4 June: no reading Pachuca de Soto, 5 June: no reading Pachuca de Soto, 6 June: 40.4 µg/m³, 3.8× usual Pachuca de Soto, 7 June: 30.8 µg/m³, 2.9× usual Pachuca de Soto, 8 June: no reading Pachuca de Soto, 9 June: no reading Pachuca de Soto, 10 June: no reading San Luis de la Paz San Luis de la Paz, 3 June: 19.3 µg/m³, 1.2× usual San Luis de la Paz, 4 June: 18.1 µg/m³, 1.1× usual San Luis de la Paz, 5 June: 28.3 µg/m³, 1.8× usual San Luis de la Paz, 6 June: 37.3 µg/m³, 2.3× usual San Luis de la Paz, 7 June: 40.5 µg/m³, 2.5× usual San Luis de la Paz, 8 June: 18.4 µg/m³, 1.2× usual San Luis de la Paz, 9 June: 20.0 µg/m³, 1.3× usual San Luis de la Paz, 10 June: 18.6 µg/m³, 1.2× usual Cuernavaca Cuernavaca, 3 June: no reading Cuernavaca, 4 June: no reading Cuernavaca, 5 June: no reading Cuernavaca, 6 June: 34.4 µg/m³, 2.9× usual Cuernavaca, 7 June: 38.2 µg/m³, 3.3× usual Cuernavaca, 8 June: no reading Cuernavaca, 9 June: no reading Cuernavaca, 10 June: no reading Zacatepec de Hidalgo Zacatepec de Hidalgo, 3 June: no reading Zacatepec de Hidalgo, 4 June: no reading Zacatepec de Hidalgo, 5 June: no reading Zacatepec de Hidalgo, 6 June: 32.2 µg/m³, 3.4× usual Zacatepec de Hidalgo, 7 June: 33.2 µg/m³, 3.5× usual Zacatepec de Hidalgo, 8 June: no reading Zacatepec de Hidalgo, 9 June: no reading Zacatepec de Hidalgo, 10 June: no reading Tula de Allende Tula de Allende, 3 June: no reading Tula de Allende, 4 June: no reading Tula de Allende, 5 June: no reading Tula de Allende, 6 June: 30.7 µg/m³, 2.3× usual Tula de Allende, 7 June: 43.2 µg/m³, 3.3× usual Tula de Allende, 8 June: no reading Tula de Allende, 9 June: no reading Tula de Allende, 10 June: no reading Irapuato Irapuato, 3 June: 16.4 µg/m³, 1.2× usual Irapuato, 4 June: 16.2 µg/m³, 1.2× usual Irapuato, 5 June: 23.3 µg/m³, 1.7× usual Irapuato, 6 June: 25.8 µg/m³, 1.8× usual Irapuato, 7 June: 44.8 µg/m³, 3.2× usual Irapuato, 8 June: 21.8 µg/m³, 1.6× usual Irapuato, 9 June: 17.5 µg/m³, 1.3× usual Irapuato, 10 June: 17.6 µg/m³, 1.3× usual San Miguel de Allen… San Miguel de Allende, 3 June: 15.7 µg/m³, 1.1× usual San Miguel de Allende, 4 June: 18.2 µg/m³, 1.3× usual San Miguel de Allende, 5 June: 23.1 µg/m³, 1.7× usual San Miguel de Allende, 6 June: 27.6 µg/m³, 2.0× usual San Miguel de Allende, 7 June: 42.0 µg/m³, 3.1× usual San Miguel de Allende, 8 June: 19.3 µg/m³, 1.4× usual San Miguel de Allende, 9 June: 20.3 µg/m³, 1.5× usual San Miguel de Allende, 10 June: 15.4 µg/m³, 1.1× usual Santiago de Queréta… Santiago de Querétaro, 3 June: no reading Santiago de Querétaro, 4 June: 21.8 µg/m³, 1.7× usual Santiago de Querétaro, 5 June: 20.5 µg/m³, 1.6× usual Santiago de Querétaro, 6 June: 25.6 µg/m³, 2.0× usual Santiago de Querétaro, 7 June: 37.0 µg/m³, 2.9× usual Santiago de Querétaro, 8 June: no reading Santiago de Querétaro, 9 June: no reading Santiago de Querétaro, 10 June: no reading León de los Aldama León de los Aldama, 3 June: 19.5 µg/m³, 1.1× usual León de los Aldama, 4 June: 19.8 µg/m³, 1.1× usual León de los Aldama, 5 June: 26.3 µg/m³, 1.5× usual León de los Aldama, 6 June: 27.9 µg/m³, 1.5× usual León de los Aldama, 7 June: 36.6 µg/m³, 2.0× usual León de los Aldama, 8 June: 20.8 µg/m³, 1.2× usual León de los Aldama, 9 June: no reading León de los Aldama, 10 June: 18.2 µg/m³, 1.0× usual Guanajuato Guanajuato, 3 June: 15.8 µg/m³, 1.0× usual Guanajuato, 4 June: 16.4 µg/m³, 1.1× usual Guanajuato, 5 June: 22.0 µg/m³, 1.4× usual Guanajuato, 6 June: 23.4 µg/m³, 1.5× usual Guanajuato, 7 June: 34.0 µg/m³, 2.2× usual Guanajuato, 8 June: 16.9 µg/m³, 1.1× usual Guanajuato, 9 June: 16.8 µg/m³, 1.1× usual Guanajuato, 10 June: 14.9 µg/m³, 1.0× usual Puebla Puebla, 3 June: no reading Puebla, 4 June: no reading Puebla, 5 June: no reading Puebla, 6 June: 28.4 µg/m³, 1.8× usual Puebla, 7 June: 32.4 µg/m³, 2.1× usual Puebla, 8 June: 27.4 µg/m³, 1.8× usual Puebla, 9 June: no reading Puebla, 10 June: no reading Abasolo Abasolo, 3 June: 14.0 µg/m³, 1.0× usual Abasolo, 4 June: 15.2 µg/m³, 1.1× usual Abasolo, 5 June: 16.1 µg/m³, 1.2× usual Abasolo, 6 June: 16.6 µg/m³, 1.2× usual Abasolo, 7 June: 29.8 µg/m³, 2.1× usual Abasolo, 8 June: 16.2 µg/m³, 1.2× usual Abasolo, 9 June: 14.9 µg/m³, 1.1× usual Abasolo, 10 June: 14.1 µg/m³, 1.0× usual 3 Jun 4 5 6 7 8 9 10 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Tehuacán Puebla, Mexico 2 6 June 13.3 4.7× Pachuca de Soto Hidalgo, Mexico 2 6 June 10.6 3.8× Zacatepec de Hidalgo Morelos, Mexico 2 7 June 9.6 3.5× Guadalajara Jalisco, Mexico 2 7 June 15.6 3.3× Mixquiahuala de Juárez Hidalgo, Mexico 2 7 June 14.7 3.3× San Juan del Río Querétaro, Mexico 2 7 June 12.1 3.3× Tula de Allende Hidalgo, Mexico 2 7 June 13.2 3.3× Cuernavaca Morelos, Mexico 2 7 June 11.7 3.3× Irapuato Guanajuato, Mexico 1 7 June 14.0 3.2× San Miguel de Allende Guanajuato, Mexico 1 7 June 13.7 3.1× Santiago de Querétaro Querétaro, Mexico 1 7 June 12.9 2.9× San Luis de la Paz Guanajuato, Mexico 2 7 June 16.0 2.5× Guanajuato Guanajuato, Mexico 1 7 June 15.4 2.2× Abasolo Guanajuato, Mexico 1 7 June 14.0 2.1× Puebla Puebla, Mexico 1 7 June 15.6 2.1× León de los Aldama Guanajuato, Mexico 1 7 June 18.0 2.0×
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 3 of 16 episodes in Mexico since our records began, by cities reached.
Southern Mexico, January 2026 20 Southern United States and Mexico, June 2023 17 Southern Mexico, June 2024 16 Southern Mexico, January 2024 14 Southern Mexico, January 2026 12 Northern Mexico and United States, May 2025 12 Southern Mexico, December 2023 10 Guanajuato and Jalisco, Mexico, June 2023 10 Hidalgo and Puebla, Mexico, November 2025 9 Guanajuato, Mexico, December 2024 9 Southern United States and Mexico, April 2024 9 Southern United States and Mexico, March and April 2025 8 Bars: cities reached; colour: the level of the episode's highest daily reading. All 16 .
Use this page SmogRank, Southern Mexico, June 2024: 16 cities with PM2.5 at twice their usual or more, 6 to 7 June 2024, smogrank.com/episodes/2024-06-southern-mexico (accessed 3 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.
