SmogRank / Episodes / United States
Southern United States and Mexico, 19 to 28 May 2024
For 10 days, from 19 to 28 May 2024, 32 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: 74.2 µg/m³ on 26 May, about 4.5× its usual 16.4.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 32 in 2 countries
Days 10 19 to 28 May 2024
Worst day 27 May 24 cities counted
Furthest above usual 5.1× Live Oak
Day by day
Play 27 May 24 cities at twice their usual or more
Belton Port Arthur Denton Piedras Negras Lafayette Ada Lawton McAlester Moore Oklahoma City Fort Smith Cadereyta Jiménez Monterrey Little Rock Shreveport Texarkana Fort Worth Conroe Ciudad Apodaca Houston Eagle Pass Baytown College Station San Antonio La Porte Laredo Sulphur Saginaw Corsicana Galveston Missouri City Dallas Austin Pasadena Mission Bend Heroica Matamoros Taylor San Marcos Saltillo Edinburg Corpus Christi Mission Live Oak 16 May 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 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, 16 May: 51.2 µg/m³ Mission, 17 May: 20.9 µg/m³ Mission, 18 May: 25.6 µg/m³ Mission, 19 May: 39.1 µg/m³, 2.7× its usual 14.5 Mission, 20 May: 43.3 µg/m³, 3.0× its usual 14.2 Mission, 21 May: 40.0 µg/m³, 2.9× its usual 13.9 Mission, 22 May: 38.7 µg/m³, 2.9× its usual 13.2 Mission, 23 May: 37.6 µg/m³, 2.9× its usual 13.1 Mission, 24 May: 55.6 µg/m³, 4.2× its usual 13.3 Mission, 25 May: 47.4 µg/m³, 3.6× its usual 13.1 Mission, 26 May: 57.5 µg/m³, 4.4× its usual 13.0 Mission, 27 May: 58.4 µg/m³, 4.7× its usual 12.5 Mission, 28 May: 39.4 µg/m³, 3.2× its usual 12.3 Mission, 29 May: 14.6 µg/m³ Mission, 30 May: 26.4 µg/m³ Mission, 31 May: 30.2 µg/m³ Heroica Matamoros Heroica Matamoros, 16 May: 41.7 µg/m³ Heroica Matamoros, 17 May: 33.8 µg/m³ Heroica Matamoros, 18 May: 27.6 µg/m³ Heroica Matamoros, 19 May: 36.8 µg/m³, 2.8× its usual 13.2 Heroica Matamoros, 20 May: 34.4 µg/m³, 2.6× its usual 13.0 Heroica Matamoros, 21 May: 34.7 µg/m³, 2.7× its usual 12.8 Heroica Matamoros, 22 May: 25.3 µg/m³, 2.1× its usual 12.2 Heroica Matamoros, 23 May: no reading Heroica Matamoros, 24 May: 30.5 µg/m³, 2.5× its usual 12.1 Heroica Matamoros, 25 May: 29.4 µg/m³, 2.4× its usual 12.0 Heroica Matamoros, 26 May: 43.3 µg/m³, 3.6× its usual 12.0 Heroica Matamoros, 27 May: 50.5 µg/m³, 4.2× its usual 11.9 Heroica Matamoros, 28 May: 28.8 µg/m³, 2.4× its usual 11.8 Heroica Matamoros, 29 May: 18.1 µg/m³ Heroica Matamoros, 30 May: 19.4 µg/m³ Heroica Matamoros, 31 May: 21.5 µg/m³ Corpus Christi Corpus Christi, 16 May: 38.8 µg/m³ Corpus Christi, 17 May: 10.1 µg/m³ Corpus Christi, 18 May: 23.0 µg/m³ Corpus Christi, 19 May: 32.2 µg/m³, 2.6× its usual 12.4 Corpus Christi, 20 May: 29.8 µg/m³, 2.5× its usual 11.9 Corpus Christi, 21 May: 38.2 µg/m³, 3.4× its usual 11.1 Corpus Christi, 22 May: 32.6 µg/m³, 3.0× its usual 11.0 Corpus Christi, 23 May: 34.6 µg/m³, 3.1× its usual 11.0 Corpus Christi, 24 May: 33.9 µg/m³, 3.1× its usual 11.1 Corpus Christi, 25 May: 35.1 µg/m³, 3.1× its usual 11.4 Corpus Christi, 26 May: 41.2 µg/m³, 3.7× its usual 11.1 Corpus Christi, 27 May: 51.9 µg/m³, 4.7× its usual 11.0 Corpus Christi, 28 May: 25.9 µg/m³, 2.4× its usual 11.0 Corpus Christi, 29 May: 15.2 µg/m³ Corpus Christi, 30 May: 21.8 µg/m³ Corpus Christi, 31 May: 16.5 µg/m³ Laredo Laredo, 16 May: no reading Laredo, 17 May: 7.1 µg/m³ Laredo, 18 May: 15.3 µg/m³ Laredo, 19 May: 31.0 µg/m³, 2.5× its usual 12.4 Laredo, 20 May: 34.3 µg/m³, 2.8× its usual 12.2 Laredo, 21 May: 38.9 µg/m³, 3.2× its usual 12.2 Laredo, 22 May: 42.0 µg/m³, 3.5× its usual 12.0 Laredo, 23 May: no reading Laredo, 24 May: 39.0 µg/m³, 3.3× its usual 12.0 Laredo, 25 May: 42.3 µg/m³, 3.5× its usual 12.0 Laredo, 26 May: 36.9 µg/m³, 3.1× its usual 11.8 Laredo, 27 May: 39.4 µg/m³, 3.4× its usual 11.7 Laredo, 28 May: 29.6 µg/m³, 2.7× its usual 10.9 Laredo, 29 May: 12.7 µg/m³ Laredo, 30 May: 23.9 µg/m³ Laredo, 31 May: 22.6 µg/m³ Edinburg Edinburg, 16 May: 46.3 µg/m³ Edinburg, 17 May: 18.8 µg/m³ Edinburg, 18 May: 23.7 µg/m³ Edinburg, 19 May: 30.5 µg/m³, 2.3× its usual 13.3 Edinburg, 20 May: 35.3 µg/m³, 2.8× its usual 12.7 Edinburg, 21 May: 36.2 µg/m³, 2.9× its usual 12.5 Edinburg, 22 May: 31.7 µg/m³, 2.6× its usual 12.4 Edinburg, 23 May: no reading Edinburg, 24 May: 47.0 µg/m³, 3.9× its usual 12.0 Edinburg, 25 May: 38.4 µg/m³, 3.1× its usual 12.4 Edinburg, 26 May: 49.6 µg/m³, 4.3× its usual 11.6 Edinburg, 27 May: 52.4 µg/m³, 4.6× its usual 11.3 Edinburg, 28 May: 30.3 µg/m³, 2.7× its usual 11.1 Edinburg, 29 May: 13.0 µg/m³ Edinburg, 30 May: 23.4 µg/m³ Edinburg, 31 May: 26.0 µg/m³ Live Oak Live Oak, 16 May: 16.9 µg/m³ Live Oak, 17 May: 9.1 µg/m³ Live Oak, 18 May: 15.8 µg/m³ Live Oak, 19 May: 27.2 µg/m³, 2.7× its usual 10.1 Live Oak, 20 May: 23.4 µg/m³ Live Oak, 21 May: 33.2 µg/m³, 3.5× its usual 9.5 Live Oak, 22 May: 36.8 µg/m³, 3.9× its usual 9.5 Live Oak, 23 May: 38.2 µg/m³, 4.0× its usual 9.5 Live Oak, 24 May: 42.7 µg/m³, 4.5× its usual 9.5 Live Oak, 25 May: 39.3 µg/m³, 4.1× its usual 9.5 Live Oak, 26 May: 40.1 µg/m³, 4.2× its usual 9.5 Live Oak, 27 May: 48.0 µg/m³, 5.1× its usual 9.5 Live Oak, 28 May: 28.4 µg/m³, 3.0× its usual 9.5 Live Oak, 29 May: 9.7 µg/m³ Live Oak, 30 May: 24.5 µg/m³ Live Oak, 31 May: 11.2 µg/m³ Saltillo Saltillo, 16 May: no reading Saltillo, 17 May: no reading Saltillo, 18 May: no reading Saltillo, 19 May: 22.4 µg/m³ Saltillo, 20 May: no reading Saltillo, 21 May: 69.1 µg/m³, 4.0× its usual 17.3 Saltillo, 22 May: no reading Saltillo, 23 May: no reading Saltillo, 24 May: no reading Saltillo, 25 May: no reading Saltillo, 26 May: 74.2 µg/m³, 4.5× its usual 16.4 Saltillo, 27 May: no reading Saltillo, 28 May: no reading Saltillo, 29 May: no reading Saltillo, 30 May: no reading Saltillo, 31 May: no reading Dallas Dallas, 16 May: 10.1 µg/m³ Dallas, 17 May: 7.4 µg/m³ Dallas, 18 May: 10.2 µg/m³ Dallas, 19 May: 14.5 µg/m³ Dallas, 20 May: 14.2 µg/m³ Dallas, 21 May: 31.5 µg/m³, 3.4× its usual 9.4 Dallas, 22 May: 26.2 µg/m³, 2.8× its usual 9.2 Dallas, 23 May: 18.4 µg/m³ Dallas, 24 May: 27.8 µg/m³, 2.8× its usual 9.9 Dallas, 25 May: 30.8 µg/m³, 3.1× its usual 10.0 Dallas, 26 May: 24.4 µg/m³ Dallas, 27 May: 39.3 µg/m³, 3.9× its usual 10.1 Dallas, 28 May: 11.9 µg/m³ Dallas, 29 May: 10.0 µg/m³ Dallas, 30 May: 9.5 µg/m³ Dallas, 31 May: 4.1 µg/m³ Austin Austin, 16 May: 13.0 µg/m³ Austin, 17 May: 7.8 µg/m³ Austin, 18 May: 14.5 µg/m³ Austin, 19 May: 21.8 µg/m³ Austin, 20 May: 18.6 µg/m³ Austin, 21 May: 30.5 µg/m³, 3.0× its usual 10.2 Austin, 22 May: 29.6 µg/m³, 2.9× its usual 10.1 Austin, 23 May: 25.7 µg/m³, 2.5× its usual 10.1 Austin, 24 May: 33.9 µg/m³, 3.2× its usual 10.5 Austin, 25 May: 32.9 µg/m³, 3.1× its usual 10.7 Austin, 26 May: 33.7 µg/m³, 3.2× its usual 10.6 Austin, 27 May: 40.6 µg/m³, 3.9× its usual 10.5 Austin, 28 May: 23.3 µg/m³ Austin, 29 May: 9.9 µg/m³ Austin, 30 May: 15.3 µg/m³ Austin, 31 May: 8.5 µg/m³ Saginaw Saginaw, 16 May: 14.6 µg/m³ Saginaw, 17 May: 9.8 µg/m³ Saginaw, 18 May: 12.5 µg/m³ Saginaw, 19 May: 16.7 µg/m³ Saginaw, 20 May: 15.8 µg/m³ Saginaw, 21 May: 30.3 µg/m³, 3.4× its usual 9.0 Saginaw, 22 May: 32.7 µg/m³, 3.6× its usual 9.0 Saginaw, 23 May: no reading Saginaw, 24 May: 29.4 µg/m³, 3.2× its usual 9.1 Saginaw, 25 May: 31.1 µg/m³, 3.4× its usual 9.2 Saginaw, 26 May: 18.3 µg/m³ Saginaw, 27 May: 24.7 µg/m³ Saginaw, 28 May: 16.4 µg/m³ Saginaw, 29 May: 12.3 µg/m³ Saginaw, 30 May: 13.6 µg/m³ Saginaw, 31 May: 6.9 µg/m³ College Station College Station, 16 May: 9.8 µg/m³ College Station, 17 May: 7.5 µg/m³ College Station, 18 May: 12.9 µg/m³ College Station, 19 May: 14.8 µg/m³ College Station, 20 May: 15.1 µg/m³ College Station, 21 May: 27.7 µg/m³, 3.3× its usual 8.3 College Station, 22 May: 21.2 µg/m³ College Station, 23 May: no reading College Station, 24 May: 25.6 µg/m³, 3.0× its usual 8.5 College Station, 25 May: 26.0 µg/m³, 3.1× its usual 8.4 College Station, 26 May: 29.3 µg/m³, 3.5× its usual 8.4 College Station, 27 May: 24.9 µg/m³ College Station, 28 May: 20.7 µg/m³ College Station, 29 May: 9.1 µg/m³ College Station, 30 May: 11.2 µg/m³ College Station, 31 May: 3.8 µg/m³ Corsicana Corsicana, 16 May: 11.6 µg/m³ Corsicana, 17 May: 6.4 µg/m³ Corsicana, 18 May: 9.4 µg/m³ Corsicana, 19 May: 16.1 µg/m³ Corsicana, 20 May: 12.2 µg/m³ Corsicana, 21 May: 27.1 µg/m³, 3.2× its usual 8.6 Corsicana, 22 May: 26.1 µg/m³, 3.1× its usual 8.5 Corsicana, 23 May: no reading Corsicana, 24 May: 24.9 µg/m³ Corsicana, 25 May: 29.1 µg/m³, 3.2× its usual 9.2 Corsicana, 26 May: 29.4 µg/m³, 3.2× its usual 9.3 Corsicana, 27 May: 33.8 µg/m³, 3.6× its usual 9.4 Corsicana, 28 May: 14.0 µg/m³ Corsicana, 29 May: 10.2 µg/m³ Corsicana, 30 May: 10.7 µg/m³ Corsicana, 31 May: 3.7 µg/m³ Mission Bend Mission Bend, 16 May: 15.2 µg/m³ Mission Bend, 17 May: 13.6 µg/m³ Mission Bend, 18 May: 19.0 µg/m³ Mission Bend, 19 May: 11.3 µg/m³ Mission Bend, 20 May: 16.2 µg/m³ Mission Bend, 21 May: 26.9 µg/m³, 2.6× its usual 10.3 Mission Bend, 22 May: 19.8 µg/m³ Mission Bend, 23 May: no reading Mission Bend, 24 May: 19.9 µg/m³ Mission Bend, 25 May: 24.7 µg/m³ Mission Bend, 26 May: 29.9 µg/m³, 2.8× its usual 10.6 Mission Bend, 27 May: 43.1 µg/m³, 4.1× its usual 10.6 Mission Bend, 28 May: no reading Mission Bend, 29 May: no reading Mission Bend, 30 May: 8.2 µg/m³ Mission Bend, 31 May: 5.9 µg/m³ Conroe Conroe, 16 May: 14.7 µg/m³ Conroe, 17 May: 11.0 µg/m³ Conroe, 18 May: 17.1 µg/m³ Conroe, 19 May: 21.3 µg/m³ Conroe, 20 May: 18.3 µg/m³ Conroe, 21 May: 26.6 µg/m³, 2.6× its usual 10.1 Conroe, 22 May: 21.2 µg/m³ Conroe, 23 May: no reading Conroe, 24 May: 23.1 µg/m³ Conroe, 25 May: 26.4 µg/m³, 2.6× its usual 10.3 Conroe, 26 May: 32.8 µg/m³, 3.1× its usual 10.5 Conroe, 27 May: 29.3 µg/m³, 2.7× its usual 10.7 Conroe, 28 May: 25.0 µg/m³, 2.3× its usual 10.7 Conroe, 29 May: 11.8 µg/m³ Conroe, 30 May: 8.7 µg/m³ Conroe, 31 May: 6.4 µg/m³ Houston Houston, 16 May: 15.0 µg/m³ Houston, 17 May: no reading Houston, 18 May: 21.8 µg/m³ Houston, 19 May: 12.6 µg/m³ Houston, 20 May: 13.8 µg/m³ Houston, 21 May: 26.0 µg/m³, 2.2× its usual 11.7 Houston, 22 May: 21.1 µg/m³ Houston, 23 May: 20.4 µg/m³ Houston, 24 May: 20.1 µg/m³ Houston, 25 May: 25.2 µg/m³, 2.1× its usual 12.0 Houston, 26 May: 28.3 µg/m³, 2.4× its usual 12.0 Houston, 27 May: 40.5 µg/m³, 3.3× its usual 12.1 Houston, 28 May: 18.8 µg/m³ Houston, 29 May: 15.6 µg/m³ Houston, 30 May: 10.9 µg/m³ Houston, 31 May: 7.5 µg/m³ Fort Worth Fort Worth, 16 May: 9.5 µg/m³ Fort Worth, 17 May: 6.1 µg/m³ Fort Worth, 18 May: 10.3 µg/m³ Fort Worth, 19 May: 14.9 µg/m³ Fort Worth, 20 May: 13.9 µg/m³ Fort Worth, 21 May: 25.9 µg/m³, 3.0× its usual 8.7 Fort Worth, 22 May: 23.7 µg/m³ Fort Worth, 23 May: no reading Fort Worth, 24 May: 25.0 µg/m³, 2.9× its usual 8.7 Fort Worth, 25 May: 27.2 µg/m³, 3.1× its usual 8.8 Fort Worth, 26 May: 21.5 µg/m³ Fort Worth, 27 May: 27.5 µg/m³, 3.1× its usual 8.8 Fort Worth, 28 May: 11.9 µg/m³ Fort Worth, 29 May: 9.3 µg/m³ Fort Worth, 30 May: 10.1 µg/m³ Fort Worth, 31 May: 4.9 µg/m³ Missouri City Missouri City, 16 May: 15.0 µg/m³ Missouri City, 17 May: 15.0 µg/m³ Missouri City, 18 May: 18.1 µg/m³ Missouri City, 19 May: 12.5 µg/m³ Missouri City, 20 May: 15.8 µg/m³ Missouri City, 21 May: 25.7 µg/m³, 2.6× its usual 9.7 Missouri City, 22 May: 20.2 µg/m³ Missouri City, 23 May: no reading Missouri City, 24 May: 19.8 µg/m³ Missouri City, 25 May: 24.1 µg/m³ Missouri City, 26 May: 28.1 µg/m³, 2.8× its usual 10.2 Missouri City, 27 May: 40.4 µg/m³, 3.8× its usual 10.5 Missouri City, 28 May: 19.2 µg/m³ Missouri City, 29 May: 15.4 µg/m³ Missouri City, 30 May: 9.4 µg/m³ Missouri City, 31 May: 7.4 µg/m³ Taylor Taylor, 16 May: 9.0 µg/m³ Taylor, 17 May: 6.7 µg/m³ Taylor, 18 May: 11.4 µg/m³ Taylor, 19 May: 15.0 µg/m³ Taylor, 20 May: 15.3 µg/m³ Taylor, 21 May: 25.1 µg/m³, 3.6× its usual 6.9 Taylor, 22 May: 22.1 µg/m³ Taylor, 23 May: 17.0 µg/m³ Taylor, 24 May: 25.4 µg/m³, 3.7× its usual 6.9 Taylor, 25 May: 25.0 µg/m³, 3.6× its usual 6.9 Taylor, 26 May: 28.3 µg/m³, 4.1× its usual 6.9 Taylor, 27 May: 29.9 µg/m³, 4.3× its usual 6.9 Taylor, 28 May: 19.6 µg/m³ Taylor, 29 May: 6.6 µg/m³ Taylor, 30 May: no reading Taylor, 31 May: no reading Monterrey Monterrey, 16 May: no reading Monterrey, 17 May: no reading Monterrey, 18 May: no reading Monterrey, 19 May: no reading Monterrey, 20 May: no reading Monterrey, 21 May: no reading Monterrey, 22 May: 45.3 µg/m³, 2.6× its usual 17.4 Monterrey, 23 May: 45.9 µg/m³, 2.6× its usual 17.7 Monterrey, 24 May: 34.9 µg/m³, 2.0× its usual 17.4 Monterrey, 25 May: 38.0 µg/m³, 2.2× its usual 17.4 Monterrey, 26 May: no reading Monterrey, 27 May: no reading Monterrey, 28 May: no reading Monterrey, 29 May: no reading Monterrey, 30 May: no reading Monterrey, 31 May: no reading San Marcos San Marcos, 16 May: 13.0 µg/m³ San Marcos, 17 May: 6.7 µg/m³ San Marcos, 18 May: 11.5 µg/m³ San Marcos, 19 May: 19.9 µg/m³ San Marcos, 20 May: 15.8 µg/m³ San Marcos, 21 May: 24.0 µg/m³ San Marcos, 22 May: 28.5 µg/m³, 3.6× its usual 8.0 San Marcos, 23 May: 21.9 µg/m³ San Marcos, 24 May: 27.6 µg/m³, 3.4× its usual 8.1 San Marcos, 25 May: 27.7 µg/m³, 3.4× its usual 8.2 San Marcos, 26 May: 30.6 µg/m³, 3.8× its usual 8.1 San Marcos, 27 May: 36.3 µg/m³, 4.4× its usual 8.3 San Marcos, 28 May: 18.6 µg/m³ San Marcos, 29 May: 10.7 µg/m³ San Marcos, 30 May: no reading San Marcos, 31 May: no reading San Antonio San Antonio, 16 May: 13.8 µg/m³ San Antonio, 17 May: 8.5 µg/m³ San Antonio, 18 May: 13.1 µg/m³ San Antonio, 19 May: 21.1 µg/m³ San Antonio, 20 May: 18.5 µg/m³ San Antonio, 21 May: 24.6 µg/m³ San Antonio, 22 May: 26.6 µg/m³, 2.8× its usual 9.6 San Antonio, 23 May: 23.5 µg/m³ San Antonio, 24 May: 31.6 µg/m³, 3.2× its usual 9.8 San Antonio, 25 May: 27.9 µg/m³, 2.9× its usual 9.7 San Antonio, 26 May: 30.9 µg/m³, 3.2× its usual 9.6 San Antonio, 27 May: 33.2 µg/m³, 3.5× its usual 9.6 San Antonio, 28 May: 20.3 µg/m³ San Antonio, 29 May: 7.2 µg/m³ San Antonio, 30 May: 18.4 µg/m³ San Antonio, 31 May: 9.2 µg/m³ Cadereyta Jiménez Cadereyta Jiménez, 16 May: no reading Cadereyta Jiménez, 17 May: no reading Cadereyta Jiménez, 18 May: no reading Cadereyta Jiménez, 19 May: no reading Cadereyta Jiménez, 20 May: no reading Cadereyta Jiménez, 21 May: no reading Cadereyta Jiménez, 22 May: no reading Cadereyta Jiménez, 23 May: no reading Cadereyta Jiménez, 24 May: 31.5 µg/m³, 2.6× its usual 12.1 Cadereyta Jiménez, 25 May: no reading Cadereyta Jiménez, 26 May: no reading Cadereyta Jiménez, 27 May: no reading Cadereyta Jiménez, 28 May: no reading Cadereyta Jiménez, 29 May: no reading Cadereyta Jiménez, 30 May: no reading Cadereyta Jiménez, 31 May: no reading Eagle Pass Eagle Pass, 16 May: 30.5 µg/m³ Eagle Pass, 17 May: no reading Eagle Pass, 18 May: 7.8 µg/m³ Eagle Pass, 19 May: no reading Eagle Pass, 20 May: no reading Eagle Pass, 21 May: no reading Eagle Pass, 22 May: no reading Eagle Pass, 23 May: no reading Eagle Pass, 24 May: 28.9 µg/m³, 2.8× its usual 10.5 Eagle Pass, 25 May: 36.0 µg/m³, 3.4× its usual 10.5 Eagle Pass, 26 May: 25.3 µg/m³, 2.4× its usual 10.4 Eagle Pass, 27 May: 30.5 µg/m³, 3.1× its usual 9.8 Eagle Pass, 28 May: 27.2 µg/m³, 2.8× its usual 9.8 Eagle Pass, 29 May: 8.2 µg/m³ Eagle Pass, 30 May: 22.4 µg/m³ Eagle Pass, 31 May: 18.4 µg/m³ Shreveport Shreveport, 16 May: 20.0 µg/m³ Shreveport, 17 May: 11.2 µg/m³ Shreveport, 18 May: 12.1 µg/m³ Shreveport, 19 May: 13.0 µg/m³ Shreveport, 20 May: 14.6 µg/m³ Shreveport, 21 May: no reading Shreveport, 22 May: no reading Shreveport, 23 May: no reading Shreveport, 24 May: no reading Shreveport, 25 May: 28.8 µg/m³, 3.0× its usual 9.5 Shreveport, 26 May: 28.4 µg/m³, 3.0× its usual 9.5 Shreveport, 27 May: 21.8 µg/m³ Shreveport, 28 May: 11.0 µg/m³ Shreveport, 29 May: 11.3 µg/m³ Shreveport, 30 May: 9.9 µg/m³ Shreveport, 31 May: 6.0 µg/m³ Texarkana Texarkana, 16 May: 20.9 µg/m³ Texarkana, 17 May: 11.1 µg/m³ Texarkana, 18 May: 12.7 µg/m³ Texarkana, 19 May: 13.9 µg/m³ Texarkana, 20 May: 12.9 µg/m³ Texarkana, 21 May: 21.7 µg/m³ Texarkana, 22 May: 18.6 µg/m³ Texarkana, 23 May: no reading Texarkana, 24 May: 18.7 µg/m³ Texarkana, 25 May: 23.3 µg/m³ Texarkana, 26 May: 30.8 µg/m³, 3.0× its usual 10.1 Texarkana, 27 May: 13.4 µg/m³ Texarkana, 28 May: 8.4 µg/m³ Texarkana, 29 May: 11.5 µg/m³ Texarkana, 30 May: 9.7 µg/m³ Texarkana, 31 May: 6.4 µg/m³ Little Rock Little Rock, 16 May: 15.1 µg/m³ Little Rock, 17 May: 10.3 µg/m³ Little Rock, 18 May: 8.2 µg/m³ Little Rock, 19 May: 10.3 µg/m³ Little Rock, 20 May: 10.2 µg/m³ Little Rock, 21 May: 16.6 µg/m³ Little Rock, 22 May: 16.6 µg/m³ Little Rock, 23 May: 10.2 µg/m³ Little Rock, 24 May: 12.4 µg/m³ Little Rock, 25 May: 15.7 µg/m³ Little Rock, 26 May: 27.1 µg/m³, 2.7× its usual 10.0 Little Rock, 27 May: 14.8 µg/m³ Little Rock, 28 May: 8.2 µg/m³ Little Rock, 29 May: 8.9 µg/m³ Little Rock, 30 May: 7.5 µg/m³ Little Rock, 31 May: 8.2 µg/m³ Pasadena Pasadena, 16 May: no reading Pasadena, 17 May: no reading Pasadena, 18 May: no reading Pasadena, 19 May: no reading Pasadena, 20 May: 14.2 µg/m³ Pasadena, 21 May: 22.4 µg/m³ Pasadena, 22 May: 18.0 µg/m³ Pasadena, 23 May: no reading Pasadena, 24 May: 18.5 µg/m³ Pasadena, 25 May: 23.5 µg/m³ Pasadena, 26 May: 27.0 µg/m³, 2.5× its usual 10.9 Pasadena, 27 May: 43.1 µg/m³, 4.0× its usual 10.9 Pasadena, 28 May: 18.6 µg/m³ Pasadena, 29 May: 13.5 µg/m³ Pasadena, 30 May: 8.4 µg/m³ Pasadena, 31 May: 6.8 µg/m³ Ciudad Apodaca Ciudad Apodaca, 16 May: no reading Ciudad Apodaca, 17 May: no reading Ciudad Apodaca, 18 May: no reading Ciudad Apodaca, 19 May: no reading Ciudad Apodaca, 20 May: no reading Ciudad Apodaca, 21 May: no reading Ciudad Apodaca, 22 May: no reading Ciudad Apodaca, 23 May: no reading Ciudad Apodaca, 24 May: no reading Ciudad Apodaca, 25 May: no reading Ciudad Apodaca, 26 May: no reading Ciudad Apodaca, 27 May: 39.7 µg/m³, 3.3× its usual 12.0 Ciudad Apodaca, 28 May: no reading Ciudad Apodaca, 29 May: no reading Ciudad Apodaca, 30 May: no reading Ciudad Apodaca, 31 May: no reading Baytown Baytown, 16 May: 13.1 µg/m³ Baytown, 17 May: no reading Baytown, 18 May: 14.6 µg/m³ Baytown, 19 May: 10.8 µg/m³ Baytown, 20 May: 14.0 µg/m³ Baytown, 21 May: 18.0 µg/m³ Baytown, 22 May: 17.2 µg/m³ Baytown, 23 May: no reading Baytown, 24 May: 17.9 µg/m³ Baytown, 25 May: 23.8 µg/m³ Baytown, 26 May: 24.8 µg/m³ Baytown, 27 May: 39.3 µg/m³, 3.4× its usual 11.5 Baytown, 28 May: no reading Baytown, 29 May: 11.5 µg/m³ Baytown, 30 May: no reading Baytown, 31 May: 5.7 µg/m³ La Porte La Porte, 16 May: 10.7 µg/m³ La Porte, 17 May: 9.4 µg/m³ La Porte, 18 May: 12.6 µg/m³ La Porte, 19 May: 9.4 µg/m³ La Porte, 20 May: 11.3 µg/m³ La Porte, 21 May: 15.1 µg/m³ La Porte, 22 May: 13.9 µg/m³ La Porte, 23 May: no reading La Porte, 24 May: 14.7 µg/m³ La Porte, 25 May: 18.9 µg/m³ La Porte, 26 May: 22.2 µg/m³ La Porte, 27 May: 33.5 µg/m³, 3.5× its usual 9.6 La Porte, 28 May: 14.2 µg/m³ La Porte, 29 May: 10.6 µg/m³ La Porte, 30 May: 7.6 µg/m³ La Porte, 31 May: 5.6 µg/m³ Galveston Galveston, 16 May: 10.6 µg/m³ Galveston, 17 May: 6.9 µg/m³ Galveston, 18 May: 9.1 µg/m³ Galveston, 19 May: 8.7 µg/m³ Galveston, 20 May: 9.7 µg/m³ Galveston, 21 May: 10.5 µg/m³ Galveston, 22 May: 11.2 µg/m³ Galveston, 23 May: no reading Galveston, 24 May: 14.8 µg/m³ Galveston, 25 May: 17.0 µg/m³ Galveston, 26 May: 18.6 µg/m³ Galveston, 27 May: 33.3 µg/m³, 3.7× its usual 9.1 Galveston, 28 May: 14.2 µg/m³ Galveston, 29 May: 9.2 µg/m³ Galveston, 30 May: 5.5 µg/m³ Galveston, 31 May: 5.6 µg/m³ Sulphur Sulphur, 16 May: 10.4 µg/m³ Sulphur, 17 May: 9.8 µg/m³ Sulphur, 18 May: 9.6 µg/m³ Sulphur, 19 May: 10.1 µg/m³ Sulphur, 20 May: 9.1 µg/m³ Sulphur, 21 May: 10.6 µg/m³ Sulphur, 22 May: 11.0 µg/m³ Sulphur, 23 May: 10.9 µg/m³ Sulphur, 24 May: 13.5 µg/m³ Sulphur, 25 May: 15.1 µg/m³ Sulphur, 26 May: 14.2 µg/m³ Sulphur, 27 May: 31.1 µg/m³, 3.6× its usual 8.7 Sulphur, 28 May: 14.9 µg/m³ Sulphur, 29 May: 9.5 µg/m³ Sulphur, 30 May: 9.4 µg/m³ Sulphur, 31 May: 3.4 µg/m³ 16 May 18 20 22 24 26 28 30 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
Live Oak Texas, United States 9 27 May 9.5 5.1× Mission Texas, United States 10 27 May 12.5 4.7× Corpus Christi Texas, United States 10 27 May 11.0 4.7× Edinburg Texas, United States 9 27 May 11.3 4.6× Saltillo Coahuila, Mexico 2 26 May 16.4 4.5× San Marcos Texas, United States 5 27 May 8.3 4.4× Taylor Texas, United States 5 27 May 6.9 4.3× Heroica Matamoros Tamaulipas, Mexico 9 27 May 11.9 4.2× Mission Bend Texas, United States 3 27 May 10.6 4.1× Pasadena Texas, United States 2 27 May 10.9 4.0× Austin Texas, United States 7 27 May 10.5 3.9× Dallas Texas, United States 5 27 May 10.1 3.9× Missouri City Texas, United States 3 27 May 10.5 3.8× Galveston Texas, United States 1 27 May 9.1 3.7× Corsicana Texas, United States 5 27 May 9.4 3.6× Saginaw Texas, United States 4 22 May 9.0 3.6× Sulphur Louisiana, United States 1 27 May 8.7 3.6× Laredo Texas, United States 9 25 May 12.0 3.5× La Porte Texas, United States 1 27 May 9.6 3.5× San Antonio Texas, United States 5 27 May 9.6 3.5× College Station Texas, United States 4 26 May 8.4 3.5× Baytown Texas, United States 1 27 May 11.5 3.4× Eagle Pass Texas, United States 5 25 May 10.5 3.4× Houston Texas, United States 4 27 May 12.1 3.3× Ciudad Apodaca Nuevo León, Mexico 1 27 May 12.0 3.3× Conroe Texas, United States 5 26 May 10.5 3.1× Fort Worth Texas, United States 4 27 May 8.8 3.1× Texarkana Texas, United States 1 26 May 10.1 3.0× Shreveport Louisiana, United States 2 25 May 9.5 3.0× Little Rock Arkansas, United States 1 26 May 10.0 2.7× Monterrey Nuevo León, Mexico 4 23 May 17.7 2.6× Cadereyta Jiménez Nuevo León, Mexico 1 24 May 12.1 2.6×
Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.
Against other episodes in the United States and Mexico
Number 28 of 141 episodes in the United States and Mexico since our records began, by cities reached.
Eastern United States and Canada, 25 June to 2 July 2023 280 North-eastern United States and Canada, July 2026 264 Eastern United States and Canada, May and June 2023 261 North-eastern United States and Canada, 30 July to 9 August 2025 241 Eastern United States and Canada, July 2023 240 North-eastern United States and Canada, 3 to 9 June 2025 196 Eastern United States and Canada, 14 to 19 June 2023 161 North-eastern United States and Canada, 12 to 16 July 2025 119 North-western United States and Canada, August 2023 110 North-eastern United States and Canada, 10 to 14 June 2025 104 North-western United States and Canada, 4 to 11 August 2026 99 North-eastern United States and Canada, 14 to 19 February 2026 96 Southern United States and Mexico, 19 to 28 May 2024 32 Bars: cities reached; colour: the level of the episode's highest daily reading. All 141 .
Use this page SmogRank, Southern United States and Mexico, 19 to 28 May 2024: 32 cities with PM2.5 at twice their usual or more, 19 to 28 May 2024, smogrank.com/episodes/2024-05-19-southern-united-states-and-mexico (accessed 4 October 2026).
Copy citation Download top 10 (PNG)
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.
