SmogRank / Episodes / United States
Southern United States and Mexico, June 2023
For 6 days, from 13 to 18 June 2023, 18 cities in the United States and Mexico had PM2.5 at least twice their usual for the time of year. The worst reading was Ciudad Benito Juárez, Nuevo León, Mexico: 63.0 µg/m³ on 16 June, about 4.9× its usual 12.8.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 18 in 2 countries
Days 6 13 to 18 June 2023
Worst day 13 June 11 cities counted
Furthest above usual 4.9× Ciudad Benito Juárez
Day by day
Play 13 June 11 cities at twice their usual or more
Mission Bend College Station Missouri City Houston Pasadena Conroe La Porte Baytown Galveston Edinburg Port Arthur Piedras Negras Dallas Sulphur Denton Ciudad General Escobedo Jardines de la Silla Texarkana Saltillo Corpus Christi Cadereyta Jiménez Monterrey Santa Catarina Corsicana Shreveport Saginaw Parque Industrial Ciudad Mitras San Antonio Fort Worth Ciudad Apodaca Live Oak Laredo Belton Austin Eagle Pass García Ciudad Benito Juárez 10 Jun 11 12 13 14 15 16 17 18 19 20 21 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
Ciudad Benito Juárez Ciudad Benito Juárez, 10 June: no reading Ciudad Benito Juárez, 11 June: no reading Ciudad Benito Juárez, 12 June: no reading Ciudad Benito Juárez, 13 June: 46.0 µg/m³, 3.6× usual Ciudad Benito Juárez, 14 June: no reading Ciudad Benito Juárez, 15 June: no reading Ciudad Benito Juárez, 16 June: 63.0 µg/m³, 4.9× usual Ciudad Benito Juárez, 17 June: 52.6 µg/m³, 4.1× usual Ciudad Benito Juárez, 18 June: 59.1 µg/m³, 4.6× usual Ciudad Benito Juárez, 19 June: no reading Ciudad Benito Juárez, 20 June: no reading Ciudad Benito Juárez, 21 June: no reading Ciudad Apodaca Ciudad Apodaca, 10 June: no reading Ciudad Apodaca, 11 June: no reading Ciudad Apodaca, 12 June: no reading Ciudad Apodaca, 13 June: 36.7 µg/m³, 2.9× usual Ciudad Apodaca, 14 June: no reading Ciudad Apodaca, 15 June: no reading Ciudad Apodaca, 16 June: no reading Ciudad Apodaca, 17 June: 32.2 µg/m³, 2.6× usual Ciudad Apodaca, 18 June: no reading Ciudad Apodaca, 19 June: no reading Ciudad Apodaca, 20 June: no reading Ciudad Apodaca, 21 June: no reading Austin Austin, 10 June: 9.2 µg/m³, 0.9× usual Austin, 11 June: 9.7 µg/m³, 0.9× usual Austin, 12 June: 14.2 µg/m³, 1.4× usual Austin, 13 June: 33.6 µg/m³, 3.2× usual Austin, 14 June: 28.6 µg/m³, 2.7× usual Austin, 15 June: 29.9 µg/m³, 2.8× usual Austin, 16 June: 25.1 µg/m³, 2.4× usual Austin, 17 June: 21.8 µg/m³, 2.1× usual Austin, 18 June: 18.8 µg/m³, 1.8× usual Austin, 19 June: 17.9 µg/m³, 1.7× usual Austin, 20 June: 23.0 µg/m³, 2.2× usual Austin, 21 June: 21.3 µg/m³, 2.0× usual Live Oak Live Oak, 10 June: 9.5 µg/m³, 1.0× usual Live Oak, 11 June: 9.2 µg/m³, 0.9× usual Live Oak, 12 June: 17.8 µg/m³, 1.8× usual Live Oak, 13 June: 30.4 µg/m³, 3.1× usual Live Oak, 14 June: 28.3 µg/m³, 2.9× usual Live Oak, 15 June: 29.4 µg/m³, 3.0× usual Live Oak, 16 June: 24.1 µg/m³, 2.5× usual Live Oak, 17 June: 22.5 µg/m³, 2.3× usual Live Oak, 18 June: 17.5 µg/m³, 1.8× usual Live Oak, 19 June: 16.4 µg/m³, 1.7× usual Live Oak, 20 June: 22.6 µg/m³, 2.3× usual Live Oak, 21 June: 19.0 µg/m³, 2.0× usual García García, 10 June: no reading García, 11 June: no reading García, 12 June: no reading García, 13 June: 30.3 µg/m³, 2.9× usual García, 14 June: no reading García, 15 June: no reading García, 16 June: no reading García, 17 June: 38.2 µg/m³, 3.6× usual García, 18 June: no reading García, 19 June: no reading García, 20 June: no reading García, 21 June: no reading Parque Industrial C… Parque Industrial Ciudad Mitras, 10 June: no reading Parque Industrial Ciudad Mitras, 11 June: no reading Parque Industrial Ciudad Mitras, 12 June: no reading Parque Industrial Ciudad Mitras, 13 June: 30.1 µg/m³, 2.8× usual Parque Industrial Ciudad Mitras, 14 June: no reading Parque Industrial Ciudad Mitras, 15 June: no reading Parque Industrial Ciudad Mitras, 16 June: no reading Parque Industrial Ciudad Mitras, 17 June: no reading Parque Industrial Ciudad Mitras, 18 June: no reading Parque Industrial Ciudad Mitras, 19 June: no reading Parque Industrial Ciudad Mitras, 20 June: no reading Parque Industrial Ciudad Mitras, 21 June: no reading Monterrey Monterrey, 10 June: no reading Monterrey, 11 June: no reading Monterrey, 12 June: no reading Monterrey, 13 June: 29.8 µg/m³, 2.1× usual Monterrey, 14 June: no reading Monterrey, 15 June: no reading Monterrey, 16 June: no reading Monterrey, 17 June: 32.4 µg/m³, 2.3× usual Monterrey, 18 June: 29.1 µg/m³, 2.1× usual Monterrey, 19 June: no reading Monterrey, 20 June: no reading Monterrey, 21 June: no reading Belton Belton, 10 June: 7.9 µg/m³, 0.9× usual Belton, 11 June: 6.0 µg/m³, 0.7× usual Belton, 12 June: 9.8 µg/m³, 1.1× usual Belton, 13 June: 27.3 µg/m³, 3.1× usual Belton, 14 June: 25.8 µg/m³, 2.9× usual Belton, 15 June: 27.6 µg/m³, 3.1× usual Belton, 16 June: 23.5 µg/m³, 2.6× usual Belton, 17 June: 18.2 µg/m³, 2.0× usual Belton, 18 June: 18.0 µg/m³, 2.0× usual Belton, 19 June: 15.5 µg/m³, 1.7× usual Belton, 20 June: 20.2 µg/m³, 2.3× usual Belton, 21 June: 15.3 µg/m³, 1.7× usual Laredo Laredo, 10 June: 12.3 µg/m³, 1.2× usual Laredo, 11 June: 16.5 µg/m³, 1.6× usual Laredo, 12 June: 20.9 µg/m³, 2.0× usual Laredo, 13 June: 25.5 µg/m³, 2.4× usual Laredo, 14 June: 28.1 µg/m³, 2.7× usual Laredo, 15 June: 33.3 µg/m³, 3.1× usual Laredo, 16 June: 29.2 µg/m³, 2.8× usual Laredo, 17 June: 19.9 µg/m³, 1.9× usual Laredo, 18 June: 22.8 µg/m³, 2.2× usual Laredo, 19 June: 20.2 µg/m³, 1.9× usual Laredo, 20 June: 19.4 µg/m³, 1.8× usual Laredo, 21 June: 19.9 µg/m³, 1.9× usual San Antonio San Antonio, 10 June: 9.5 µg/m³, 1.0× usual San Antonio, 11 June: 10.0 µg/m³, 1.0× usual San Antonio, 12 June: 16.9 µg/m³, 1.8× usual San Antonio, 13 June: 25.4 µg/m³, 2.6× usual San Antonio, 14 June: 24.4 µg/m³, 2.5× usual San Antonio, 15 June: 26.5 µg/m³, 2.8× usual San Antonio, 16 June: 21.3 µg/m³, 2.2× usual San Antonio, 17 June: 19.3 µg/m³, 2.0× usual San Antonio, 18 June: 15.3 µg/m³, 1.6× usual San Antonio, 19 June: 14.9 µg/m³, 1.6× usual San Antonio, 20 June: 19.3 µg/m³, 2.0× usual San Antonio, 21 June: 16.6 µg/m³, 1.7× usual Eagle Pass Eagle Pass, 10 June: 11.9 µg/m³, 1.3× usual Eagle Pass, 11 June: 15.7 µg/m³, 1.7× usual Eagle Pass, 12 June: 19.0 µg/m³, 2.0× usual Eagle Pass, 13 June: 25.2 µg/m³, 2.7× usual Eagle Pass, 14 June: 26.7 µg/m³, 2.9× usual Eagle Pass, 15 June: 31.1 µg/m³, 3.3× usual Eagle Pass, 16 June: 28.3 µg/m³, 3.0× usual Eagle Pass, 17 June: 23.6 µg/m³, 2.5× usual Eagle Pass, 18 June: 17.6 µg/m³, 1.9× usual Eagle Pass, 19 June: 18.3 µg/m³, 2.0× usual Eagle Pass, 20 June: 17.4 µg/m³, 1.9× usual Eagle Pass, 21 June: 17.1 µg/m³, 1.8× usual Corpus Christi Corpus Christi, 10 June: 6.6 µg/m³, 0.6× usual Corpus Christi, 11 June: 5.9 µg/m³, 0.5× usual Corpus Christi, 12 June: 16.8 µg/m³, 1.4× usual Corpus Christi, 13 June: 20.0 µg/m³, 1.7× usual Corpus Christi, 14 June: 25.0 µg/m³, 2.2× usual Corpus Christi, 15 June: 17.0 µg/m³, 1.5× usual Corpus Christi, 16 June: 18.5 µg/m³, 1.6× usual Corpus Christi, 17 June: 15.8 µg/m³, 1.4× usual Corpus Christi, 18 June: 13.9 µg/m³, 1.2× usual Corpus Christi, 19 June: 20.9 µg/m³, 1.8× usual Corpus Christi, 20 June: 20.8 µg/m³, 1.8× usual Corpus Christi, 21 June: 15.7 µg/m³, 1.4× usual Shreveport Shreveport, 10 June: 12.6 µg/m³, 1.3× usual Shreveport, 11 June: 8.7 µg/m³, 0.9× usual Shreveport, 12 June: 10.3 µg/m³, 1.0× usual Shreveport, 13 June: 11.6 µg/m³, 1.2× usual Shreveport, 14 June: 12.5 µg/m³, 1.3× usual Shreveport, 15 June: 27.1 µg/m³, 2.7× usual Shreveport, 16 June: no reading Shreveport, 17 June: no reading Shreveport, 18 June: no reading Shreveport, 19 June: no reading Shreveport, 20 June: no reading Shreveport, 21 June: no reading Fort Worth Fort Worth, 10 June: 7.9 µg/m³, 0.9× usual Fort Worth, 11 June: 8.0 µg/m³, 0.9× usual Fort Worth, 12 June: 6.5 µg/m³, 0.7× usual Fort Worth, 13 June: 13.9 µg/m³, 1.5× usual Fort Worth, 14 June: 23.9 µg/m³, 2.6× usual Fort Worth, 15 June: 26.8 µg/m³, 2.9× usual Fort Worth, 16 June: 14.2 µg/m³, 1.6× usual Fort Worth, 17 June: 16.9 µg/m³, 1.9× usual Fort Worth, 18 June: 13.8 µg/m³, 1.5× usual Fort Worth, 19 June: 16.1 µg/m³, 1.8× usual Fort Worth, 20 June: 19.4 µg/m³, 2.1× usual Fort Worth, 21 June: 21.0 µg/m³, 2.3× usual Corsicana Corsicana, 10 June: 7.8 µg/m³, 0.8× usual Corsicana, 11 June: 6.4 µg/m³, 0.7× usual Corsicana, 12 June: 8.1 µg/m³, 0.8× usual Corsicana, 13 June: 15.0 µg/m³, 1.6× usual Corsicana, 14 June: 22.5 µg/m³, 2.3× usual Corsicana, 15 June: 25.9 µg/m³, 2.7× usual Corsicana, 16 June: 20.7 µg/m³, 2.2× usual Corsicana, 17 June: 18.7 µg/m³, 1.9× usual Corsicana, 18 June: 17.6 µg/m³, 1.8× usual Corsicana, 19 June: 15.9 µg/m³, 1.7× usual Corsicana, 20 June: 18.7 µg/m³, 1.9× usual Corsicana, 21 June: 18.6 µg/m³, 1.9× usual Saginaw Saginaw, 10 June: 8.6 µg/m³, 0.9× usual Saginaw, 11 June: 8.3 µg/m³, 0.9× usual Saginaw, 12 June: 5.9 µg/m³, 0.6× usual Saginaw, 13 June: 12.8 µg/m³, 1.4× usual Saginaw, 14 June: 23.0 µg/m³, 2.5× usual Saginaw, 15 June: 25.6 µg/m³, 2.8× usual Saginaw, 16 June: 12.4 µg/m³, 1.4× usual Saginaw, 17 June: 16.4 µg/m³, 1.8× usual Saginaw, 18 June: 12.5 µg/m³, 1.4× usual Saginaw, 19 June: no reading Saginaw, 20 June: 17.9 µg/m³, 2.0× usual Saginaw, 21 June: 18.7 µg/m³, 2.1× usual Santa Catarina Santa Catarina, 10 June: no reading Santa Catarina, 11 June: no reading Santa Catarina, 12 June: no reading Santa Catarina, 13 June: no reading Santa Catarina, 14 June: no reading Santa Catarina, 15 June: no reading Santa Catarina, 16 June: no reading Santa Catarina, 17 June: 38.4 µg/m³, 2.4× usual Santa Catarina, 18 June: 31.3 µg/m³, 2.0× usual Santa Catarina, 19 June: no reading Santa Catarina, 20 June: no reading Santa Catarina, 21 June: no reading Cadereyta Jiménez Cadereyta Jiménez, 10 June: no reading Cadereyta Jiménez, 11 June: no reading Cadereyta Jiménez, 12 June: no reading Cadereyta Jiménez, 13 June: no reading Cadereyta Jiménez, 14 June: no reading Cadereyta Jiménez, 15 June: no reading Cadereyta Jiménez, 16 June: no reading Cadereyta Jiménez, 17 June: 27.5 µg/m³, 2.3× usual Cadereyta Jiménez, 18 June: 26.7 µg/m³, 2.3× usual Cadereyta Jiménez, 19 June: no reading Cadereyta Jiménez, 20 June: no reading Cadereyta Jiménez, 21 June: no reading 10 Jun 12 14 16 18 20 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
Ciudad Benito Juárez Nuevo León, Mexico 4 16 June 12.8 4.9× García Nuevo León, Mexico 2 17 June 10.6 3.6× Eagle Pass Texas, United States 4 15 June 9.3 3.3× Austin Texas, United States 4 13 June 10.5 3.2× Laredo Texas, United States 4 15 June 10.6 3.1× Live Oak Texas, United States 3 13 June 9.7 3.1× Belton Texas, United States 3 15 June 8.9 3.1× Fort Worth Texas, United States 1 15 June 9.1 2.9× Ciudad Apodaca Nuevo León, Mexico 2 13 June 12.5 2.9× Saginaw Texas, United States 1 15 June 9.1 2.8× Parque Industrial Ciudad Mitras Nuevo León, Mexico 1 13 June 10.7 2.8× San Antonio Texas, United States 2 15 June 9.6 2.8× Shreveport Louisiana, United States 1 15 June 9.9 2.7× Corsicana Texas, United States 1 15 June 9.6 2.7× Santa Catarina Nuevo León, Mexico 2 17 June 15.8 2.4× Monterrey Nuevo León, Mexico 3 17 June 13.9 2.3× Cadereyta Jiménez Nuevo León, Mexico 2 17 June 11.8 2.3× Corpus Christi Texas, United States 1 14 June 11.6 2.2×
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 the United States and Mexico
Number 21 of 45 episodes in the United States and Mexico since our records began, by cities reached.
North-eastern United States and Canada, June and July 2023 279 North-eastern United States and Canada, May and June 2023 260 North-eastern United States and Canada, July 2023 241 North-eastern United States and Canada, June 2023 161 North-western United States and Canada, August 2023 110 North-eastern United States and Canada, July 2023 75 Western United States, September 2023 61 South-eastern United States, October 2023 47 North-eastern United States, July 2023 46 North-western United States and Canada, May 2023 42 Western United States, December 2023 32 Northern United States, January 2023 32 Southern United States and Mexico, June 2023 18 Bars: cities reached; colour: the level of the episode's highest daily reading. All 45 .
Use this page SmogRank, Southern United States and Mexico, June 2023: 18 cities with PM2.5 at twice their usual or more, 13 to 18 June 2023, smogrank.com/episodes/2023-06-southern-united-states-and-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.
