SmogRank / Episodes / United States
Southern United States and Mexico, June 2024
For 5 days, from 2 to 6 June 2024, 15 cities in the United States and Mexico had PM2.5 at least twice their usual for the time of year. The worst reading was Saltillo, Coahuila, Mexico: 85.8 µg/m³ on 4 June, about 5.7× its usual 15.1.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 15 in 2 countries
Days 5 2 to 6 June 2024
Worst day 4 June 13 cities counted
Furthest above usual 5.7× Saltillo
Day by day
Play 4 June 13 cities at twice their usual or more
Piedras Negras College Station Mission Bend Missouri City Houston Conroe Pasadena Corsicana Fort Worth La Porte Odessa Baytown Dallas Galveston Denton Hobbs San Antonio Monterrey Austin San Marcos Saginaw Eagle Pass Taylor Laredo Belton Live Oak Corpus Christi Heroica Matamoros Edinburg Mission Saltillo 30 May 31 1 Jun 2 3 4 5 6 7 8 9 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
Mission Mission, 30 May: 26.4 µg/m³, 2.3× usual Mission, 31 May: 30.2 µg/m³, 2.6× usual Mission, 1 June: 26.2 µg/m³, 2.3× usual Mission, 2 June: 26.3 µg/m³, 2.3× usual Mission, 3 June: 33.8 µg/m³, 2.9× usual Mission, 4 June: 41.5 µg/m³, 3.6× usual Mission, 5 June: 64.1 µg/m³, 5.5× usual Mission, 6 June: 54.7 µg/m³, 4.7× usual Mission, 7 June: 22.6 µg/m³, 1.9× usual Mission, 8 June: 20.0 µg/m³, 1.7× usual Mission, 9 June: 17.6 µg/m³, 1.5× usual Edinburg Edinburg, 30 May: 23.4 µg/m³, 2.2× usual Edinburg, 31 May: 26.0 µg/m³, 2.5× usual Edinburg, 1 June: 20.5 µg/m³, 2.0× usual Edinburg, 2 June: 23.5 µg/m³, 2.2× usual Edinburg, 3 June: 28.6 µg/m³, 2.7× usual Edinburg, 4 June: 31.1 µg/m³, 3.0× usual Edinburg, 5 June: 50.1 µg/m³, 4.8× usual Edinburg, 6 June: 38.1 µg/m³, 3.6× usual Edinburg, 7 June: 19.5 µg/m³, 1.9× usual Edinburg, 8 June: 16.6 µg/m³, 1.6× usual Edinburg, 9 June: 13.3 µg/m³, 1.3× usual Corpus Christi Corpus Christi, 30 May: 21.8 µg/m³, 2.1× usual Corpus Christi, 31 May: 16.5 µg/m³, 1.6× usual Corpus Christi, 1 June: 25.5 µg/m³, 2.5× usual Corpus Christi, 2 June: 23.7 µg/m³, 2.3× usual Corpus Christi, 3 June: 30.5 µg/m³, 2.9× usual Corpus Christi, 4 June: 35.7 µg/m³, 3.4× usual Corpus Christi, 5 June: 44.7 µg/m³, 4.3× usual Corpus Christi, 6 June: 25.1 µg/m³, 2.4× usual Corpus Christi, 7 June: 12.4 µg/m³, 1.2× usual Corpus Christi, 8 June: 11.1 µg/m³, 1.1× usual Corpus Christi, 9 June: 12.9 µg/m³, 1.2× usual Saltillo Saltillo, 30 May: no reading Saltillo, 31 May: no reading Saltillo, 1 June: no reading Saltillo, 2 June: 44.8 µg/m³, 3.0× usual Saltillo, 3 June: no reading Saltillo, 4 June: 85.8 µg/m³, 5.7× usual Saltillo, 5 June: 71.1 µg/m³, 4.7× usual Saltillo, 6 June: 62.5 µg/m³, 4.1× usual Saltillo, 7 June: no reading Saltillo, 8 June: no reading Saltillo, 9 June: no reading Monterrey Monterrey, 30 May: no reading Monterrey, 31 May: no reading Monterrey, 1 June: no reading Monterrey, 2 June: 41.9 µg/m³, 2.6× usual Monterrey, 3 June: no reading Monterrey, 4 June: no reading Monterrey, 5 June: no reading Monterrey, 6 June: no reading Monterrey, 7 June: no reading Monterrey, 8 June: no reading Monterrey, 9 June: no reading Eagle Pass Eagle Pass, 30 May: 22.4 µg/m³, 2.4× usual Eagle Pass, 31 May: 18.4 µg/m³, 2.0× usual Eagle Pass, 1 June: 22.3 µg/m³, 2.4× usual Eagle Pass, 2 June: 25.6 µg/m³, 2.8× usual Eagle Pass, 3 June: 24.0 µg/m³, 2.6× usual Eagle Pass, 4 June: 21.6 µg/m³, 2.3× usual Eagle Pass, 5 June: no reading Eagle Pass, 6 June: 29.0 µg/m³, 3.2× usual Eagle Pass, 7 June: 29.3 µg/m³, 3.2× usual Eagle Pass, 8 June: 14.1 µg/m³, 1.5× usual Eagle Pass, 9 June: 13.8 µg/m³, 1.5× usual Live Oak Live Oak, 30 May: 24.5 µg/m³, 2.5× usual Live Oak, 31 May: 11.2 µg/m³, 1.2× usual Live Oak, 1 June: 18.5 µg/m³, 1.9× usual Live Oak, 2 June: 20.7 µg/m³, 2.1× usual Live Oak, 3 June: 29.5 µg/m³, 3.0× usual Live Oak, 4 June: 38.2 µg/m³, 3.9× usual Live Oak, 5 June: 25.4 µg/m³, 2.6× usual Live Oak, 6 June: 19.5 µg/m³, 2.0× usual Live Oak, 7 June: 16.0 µg/m³, 1.6× usual Live Oak, 8 June: 9.9 µg/m³, 1.0× usual Live Oak, 9 June: 11.4 µg/m³, 1.2× usual Laredo Laredo, 30 May: 23.9 µg/m³, 2.2× usual Laredo, 31 May: 22.6 µg/m³, 2.1× usual Laredo, 1 June: 23.4 µg/m³, 2.2× usual Laredo, 2 June: 23.4 µg/m³, 2.2× usual Laredo, 3 June: 28.8 µg/m³, 2.7× usual Laredo, 4 June: 34.6 µg/m³, 3.2× usual Laredo, 5 June: 34.2 µg/m³, 3.2× usual Laredo, 6 June: 36.4 µg/m³, 3.4× usual Laredo, 7 June: 26.0 µg/m³, 2.4× usual Laredo, 8 June: 16.3 µg/m³, 1.5× usual Laredo, 9 June: 16.5 µg/m³, 1.5× usual Heroica Matamoros Heroica Matamoros, 30 May: 19.4 µg/m³, 1.9× usual Heroica Matamoros, 31 May: 21.5 µg/m³, 2.2× usual Heroica Matamoros, 1 June: 20.8 µg/m³, 2.1× usual Heroica Matamoros, 2 June: 20.5 µg/m³, 2.1× usual Heroica Matamoros, 3 June: 25.5 µg/m³, 2.6× usual Heroica Matamoros, 4 June: 33.6 µg/m³, 3.4× usual Heroica Matamoros, 5 June: 43.7 µg/m³, 4.4× usual Heroica Matamoros, 6 June: 32.9 µg/m³, 3.3× usual Heroica Matamoros, 7 June: 14.5 µg/m³, 1.5× usual Heroica Matamoros, 8 June: 11.8 µg/m³, 1.2× usual Heroica Matamoros, 9 June: 11.2 µg/m³, 1.1× usual Belton Belton, 30 May: 9.2 µg/m³, 1.0× usual Belton, 31 May: 3.4 µg/m³, 0.4× usual Belton, 1 June: 9.4 µg/m³, 1.0× usual Belton, 2 June: 16.7 µg/m³, 1.8× usual Belton, 3 June: 20.2 µg/m³, 2.2× usual Belton, 4 June: 32.5 µg/m³, 3.5× usual Belton, 5 June: 12.8 µg/m³, 1.4× usual Belton, 6 June: 9.4 µg/m³, 1.0× usual Belton, 7 June: 12.0 µg/m³, 1.3× usual Belton, 8 June: 11.1 µg/m³, 1.2× usual Belton, 9 June: 11.0 µg/m³, 1.2× usual Austin Austin, 30 May: 15.3 µg/m³, 1.4× usual Austin, 31 May: 8.5 µg/m³, 0.8× usual Austin, 1 June: 15.5 µg/m³, 1.4× usual Austin, 2 June: 17.5 µg/m³, 1.6× usual Austin, 3 June: 22.1 µg/m³, 2.0× usual Austin, 4 June: 31.2 µg/m³, 2.9× usual Austin, 5 June: 17.4 µg/m³, 1.6× usual Austin, 6 June: 15.6 µg/m³, 1.4× usual Austin, 7 June: 12.9 µg/m³, 1.2× usual Austin, 8 June: 10.1 µg/m³, 0.9× usual Austin, 9 June: 11.9 µg/m³, 1.1× usual Saginaw Saginaw, 30 May: 13.6 µg/m³, 1.4× usual Saginaw, 31 May: 6.9 µg/m³, 0.7× usual Saginaw, 1 June: 9.0 µg/m³, 0.9× usual Saginaw, 2 June: 16.2 µg/m³, 1.7× usual Saginaw, 3 June: 20.2 µg/m³, 2.1× usual Saginaw, 4 June: 29.1 µg/m³, 3.1× usual Saginaw, 5 June: 8.7 µg/m³, 0.9× usual Saginaw, 6 June: 11.5 µg/m³, 1.2× usual Saginaw, 7 June: 11.5 µg/m³, 1.2× usual Saginaw, 8 June: 10.7 µg/m³, 1.1× usual Saginaw, 9 June: 10.4 µg/m³, 1.1× usual San Marcos San Marcos, 30 May: no reading San Marcos, 31 May: no reading San Marcos, 1 June: no reading San Marcos, 2 June: no reading San Marcos, 3 June: 19.0 µg/m³, 2.2× usual San Marcos, 4 June: 26.1 µg/m³, 3.0× usual San Marcos, 5 June: 17.2 µg/m³, 2.0× usual San Marcos, 6 June: 14.1 µg/m³, 1.6× usual San Marcos, 7 June: 10.1 µg/m³, 1.2× usual San Marcos, 8 June: 7.9 µg/m³, 0.9× usual San Marcos, 9 June: 8.6 µg/m³, 1.0× usual San Antonio San Antonio, 30 May: 18.4 µg/m³, 1.9× usual San Antonio, 31 May: 9.2 µg/m³, 0.9× usual San Antonio, 1 June: 14.9 µg/m³, 1.5× usual San Antonio, 2 June: 15.4 µg/m³, 1.6× usual San Antonio, 3 June: 20.9 µg/m³, 2.2× usual San Antonio, 4 June: 25.7 µg/m³, 2.6× usual San Antonio, 5 June: 18.0 µg/m³, 1.9× usual San Antonio, 6 June: 18.8 µg/m³, 1.9× usual San Antonio, 7 June: 14.1 µg/m³, 1.5× usual San Antonio, 8 June: 8.9 µg/m³, 0.9× usual San Antonio, 9 June: 10.3 µg/m³, 1.1× usual Taylor Taylor, 30 May: no reading Taylor, 31 May: no reading Taylor, 1 June: no reading Taylor, 2 June: no reading Taylor, 3 June: 17.2 µg/m³, 2.3× usual Taylor, 4 June: 25.2 µg/m³, 3.4× usual Taylor, 5 June: 13.2 µg/m³, 1.8× usual Taylor, 6 June: 9.5 µg/m³, 1.3× usual Taylor, 7 June: 10.0 µg/m³, 1.4× usual Taylor, 8 June: 8.1 µg/m³, 1.1× usual Taylor, 9 June: 9.5 µg/m³, 1.3× usual 30 May 1 Jun 3 5 7 9 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
Saltillo Coahuila, Mexico 4 4 June 15.1 5.7× Mission Texas, United States 5 5 June 11.6 5.5× Edinburg Texas, United States 4 5 June 10.5 4.8× Heroica Matamoros Tamaulipas, Mexico 4 5 June 10.0 4.4× Corpus Christi Texas, United States 4 5 June 10.4 4.3× Live Oak Texas, United States 3 4 June 9.7 3.9× Belton Texas, United States 1 4 June 9.2 3.5× Taylor Texas, United States 1 4 June 7.4 3.4× Laredo Texas, United States 4 6 June 10.7 3.4× Eagle Pass Texas, United States 2 7 June 9.2 3.2× Saginaw Texas, United States 1 4 June 9.5 3.1× San Marcos Texas, United States 1 4 June 8.6 3.0× Austin Texas, United States 1 4 June 10.9 2.9× San Antonio Texas, United States 1 4 June 9.7 2.6× Monterrey Nuevo León, Mexico 1 2 June 15.9 2.6×
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 the United States and Mexico
Number 71 of 142 episodes in the United States and Mexico since our records began, by cities reached.
North-eastern United States and Canada, June and July 2023 280 North-eastern United States and Canada, July 2026 264 North-eastern United States and Canada, May and June 2023 261 North-eastern United States and Canada, July and August 2025 241 North-eastern United States and Canada, July 2023 240 North-eastern United States and Canada, June 2025 196 North-eastern United States and Canada, June 2023 161 North-eastern United States and Canada, July 2025 119 North-western United States and Canada, August 2023 110 North-eastern United States, June 2025 104 North-western United States and Canada, August 2026 99 North-eastern United States and Canada, February 2026 96 Southern United States and Mexico, June 2024 15 Bars: cities reached; colour: the level of the episode's highest daily reading. All 142 .
Use this page SmogRank, Southern United States and Mexico, June 2024: 15 cities with PM2.5 at twice their usual or more, 2 to 6 June 2024, smogrank.com/episodes/2024-06-southern-united-states-and-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.
