SmogRank / History / City race
Cities in Brazil, 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 Brazil for PM2.5 over the 30 days to 22 Oct 2024: São José do Rio Preto 34.3 µg/m³, Ribeirão Preto 32.5 µg/m³ and Rio Claro 26.7 µg/m³.
- 1São José do Rio PretoSão Paulo34.3
- 2Ribeirão PretoSão Paulo32.5
- 3Rio ClaroSão Paulo26.7
- 4Presidente PrudenteSão Paulo22.5
- 5BauruSão Paulo21.6
- 6LimeiraSão Paulo21.2
- 7PaulíniaSão Paulo20.5
- 8JundiaíSão Paulo19.3
- 9PiracicabaSão Paulo19.1
- 10Belo HorizonteMinas Gerais19.1
- 11ItabiraMinas Gerais18.9
- 12IbiritéMinas Gerais18.7
- 13CampinasSão Paulo18.7
- 14Santo AndréSão Paulo18.6
- 15Nova UniãoMinas Gerais18.5
- 16São PauloSão Paulo18.5
- 17CongonhasMinas Gerais18.2
- 18ParacatuMinas Gerais18.1
- 19ItaquaquecetubaSão Paulo17.8
- 20AraucáriaParaná17.2
+ 15 more cities, the next at 17.1 µg/m³
Not counted on this day, too few days measured: Vitória since 21 Oct 2024, Taubaté since 21 Oct 2024, Brasília since 21 Oct 2024 and Tubarão since 2 Sep 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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.