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 21 Jun 2024: Port Isabel 33.4 µg/m³, Mission 26.5 µg/m³ and Timberwood Park 22.4 µg/m³.
- 1Port IsabelTexas33.4
- 2MissionTexas26.5
- 3Timberwood ParkTexas22.4
- 4EdinburgTexas21.5
- 5Corpus ChristiTexas20.5
- 6LaredoTexas20.2
- 7Live OakTexas19.2
- 8HelotesTexas17.1
- 9AustinTexas16.6
- 10WindcrestTexas16.3
- 11HoustonTexas16.2
- 12Eagle PassTexas16.1
- 13La Crescenta-MontroseCalifornia16.1
- 14ConroeTexas16.0
- 15Wells BranchTexas16.0
- 16FontanaCalifornia15.7
- 17Missouri CityTexas15.4
- 18DallasTexas15.0
- 19River OaksTexas15.0
- 20SaginawTexas15.0
+ 787 more cities, the next at 14.9 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.