SmogRank / Episodes / United States

Texas, United States, April 2024

For 2 days, from 26 to 27 April 2024, 9 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was Port Isabel, Texas, United States: 53.6 µg/m³ on 27 April, about 3.9× its usual 13.7. Ended 27 April.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days226 to 27 April 2024
Worst day27 April9 cities counted
Furthest above usual3.9×Port Isabel

Day by day

27 April 9 cities at twice their usual or more
San AntonioWindcrestCorpus ChristiPiedras NegrasSan MarcosLockhartWells BranchHeroica MatamorosCiudad ApodacaCiudad General EscobedoTaylorGarcíaMission BendMissouri CityHoustonPasadenaConroeSeabrookLa PorteHighlandsBaytownGalvestonMissionEdinburgAustinHelotesLaredoLive OakEagle PassTimberwood ParkPort Isabel
23 Apr24252627282930
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

Port IsabelPort Isabel, 23 April: 22.4 µg/m³Port Isabel, 24 April: 20.0 µg/m³Port Isabel, 25 April: 34.1 µg/m³Port Isabel, 26 April: 44.7 µg/m³, 3.3× its usual 13.5Port Isabel, 27 April: 53.6 µg/m³, 3.9× its usual 13.7Port Isabel, 28 April: 60.5 µg/m³Port Isabel, 29 April: 64.2 µg/m³Port Isabel, 30 April: 58.0 µg/m³MissionMission, 23 April: 8.1 µg/m³Mission, 24 April: 13.2 µg/m³Mission, 25 April: 21.5 µg/m³Mission, 26 April: 28.7 µg/m³, 2.3× its usual 12.6Mission, 27 April: 36.8 µg/m³, 2.8× its usual 13.1Mission, 28 April: 31.8 µg/m³Mission, 29 April: 31.1 µg/m³Mission, 30 April: 20.0 µg/m³LaredoLaredo, 23 April: 7.7 µg/m³Laredo, 24 April: 11.8 µg/m³Laredo, 25 April: 19.0 µg/m³Laredo, 26 April: 27.4 µg/m³, 2.5× its usual 10.8Laredo, 27 April: 36.4 µg/m³, 3.3× its usual 11.0Laredo, 28 April: 21.5 µg/m³Laredo, 29 April: 26.0 µg/m³Laredo, 30 April: 17.2 µg/m³EdinburgEdinburg, 23 April: 9.0 µg/m³Edinburg, 24 April: 13.5 µg/m³Edinburg, 25 April: 21.7 µg/m³Edinburg, 26 April: 25.5 µg/m³, 2.2× its usual 11.4Edinburg, 27 April: 32.9 µg/m³, 2.9× its usual 11.5Edinburg, 28 April: 28.3 µg/m³Edinburg, 29 April: 28.1 µg/m³Edinburg, 30 April: 19.5 µg/m³Timberwood ParkTimberwood Park, 23 April: 7.5 µg/m³Timberwood Park, 24 April: 11.0 µg/m³Timberwood Park, 25 April: 19.3 µg/m³Timberwood Park, 26 April: 24.6 µg/m³Timberwood Park, 27 April: 33.1 µg/m³, 3.6× its usual 9.2Timberwood Park, 28 April: 17.0 µg/m³Timberwood Park, 29 April: 21.7 µg/m³Timberwood Park, 30 April: 15.9 µg/m³Eagle PassEagle Pass, 23 April: 5.3 µg/m³Eagle Pass, 24 April: 9.5 µg/m³Eagle Pass, 25 April: 16.5 µg/m³Eagle Pass, 26 April: 22.1 µg/m³Eagle Pass, 27 April: 31.8 µg/m³, 3.5× its usual 9.2Eagle Pass, 28 April: 15.9 µg/m³Eagle Pass, 29 April: 15.5 µg/m³Eagle Pass, 30 April: 21.8 µg/m³Live OakLive Oak, 23 April: 7.2 µg/m³Live Oak, 24 April: 9.5 µg/m³Live Oak, 25 April: 17.0 µg/m³Live Oak, 26 April: 21.2 µg/m³Live Oak, 27 April: 29.0 µg/m³, 3.4× its usual 8.6Live Oak, 28 April: 15.6 µg/m³Live Oak, 29 April: 20.5 µg/m³Live Oak, 30 April: 13.6 µg/m³HelotesHelotes, 23 April: 7.2 µg/m³Helotes, 24 April: 8.8 µg/m³Helotes, 25 April: 15.9 µg/m³Helotes, 26 April: 19.3 µg/m³Helotes, 27 April: 27.2 µg/m³, 3.0× its usual 9.1Helotes, 28 April: 15.6 µg/m³Helotes, 29 April: 18.3 µg/m³Helotes, 30 April: 13.2 µg/m³AustinAustin, 23 April: 7.9 µg/m³Austin, 24 April: 10.3 µg/m³Austin, 25 April: 16.4 µg/m³Austin, 26 April: 20.2 µg/m³Austin, 27 April: 26.6 µg/m³, 3.0× its usual 8.9Austin, 28 April: 14.3 µg/m³Austin, 29 April: 17.5 µg/m³Austin, 30 April: 14.3 µg/m³23 Apr24252627282930
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
Port IsabelTexas, United States2 53.627 April13.73.9×
Timberwood ParkTexas, United States1 33.127 April9.23.6×
Eagle PassTexas, United States1 31.827 April9.23.5×
Live OakTexas, United States1 29.027 April8.63.4×
LaredoTexas, United States2 36.427 April11.03.3×
HelotesTexas, United States1 27.227 April9.13.0×
AustinTexas, United States1 26.627 April8.93.0×
EdinburgTexas, United States2 32.927 April11.52.9×
MissionTexas, United States2 36.827 April13.12.8×

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

Number 135 of 151 episodes in the United States since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 151.

Use this page

SmogRank, Texas, United States, April 2024: 9 cities with PM2.5 at twice their usual or more, 26 to 27 April 2024, smogrank.com/episodes/2024-04-texas-united-states (accessed 5 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.