SmogRank / History / City race
Cities in United States, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in United States for PM2.5 over the 30 days to 22 May 2024: Port Isabel 48.4 µg/m³, Mission 31.6 µg/m³ and Edinburg 27.5 µg/m³.
- 1Port IsabelTexas48.4
- 2MissionTexas31.6
- 3EdinburgTexas27.5
- 4LaredoTexas24.0
- 5Corpus ChristiTexas23.4
- 6Timberwood ParkTexas21.0
- 7Live OakTexas19.0
- 8Eagle PassTexas18.9
- 9HelotesTexas18.1
- 10WindcrestTexas16.8
- 11AustinTexas16.3
- 12San AntonioTexas15.8
- 13Wells BranchTexas15.7
- 14HoustonTexas15.1
- 15Missouri CityTexas14.7
- 16ConroeTexas14.5
- 17Mission BendTexas14.3
- 18FontanaCalifornia13.8
- 19Lacy-LakeviewTexas13.6
- 20River OaksTexas13.6
+ 790 more cities, the next at 13.6 µg/m³
Not counted on this day, too few days measured: Socorro since 15 May 2024 and Wichita since 30 Apr 2024.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites. We are building the reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.