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 12 Oct 2024: Ribeirão Preto 44.7 µg/m³, São José do Rio Preto 41.3 µg/m³ and Rio Claro 30.7 µg/m³.
- 1Ribeirão PretoSão Paulo44.7
- 2São José do Rio PretoSão Paulo41.3
- 3Rio ClaroSão Paulo30.7
- 4Belo HorizonteMinas Gerais26.5
- 5CongonhasMinas Gerais25.2
- 6BauruSão Paulo25.2
- 7LimeiraSão Paulo25.0
- 8Presidente PrudenteSão Paulo24.8
- 9PaulíniaSão Paulo23.9
- 10Nova UniãoMinas Gerais23.7
- 11IbiritéMinas Gerais23.5
- 12JundiaíSão Paulo23.2
- 13CampinasSão Paulo22.9
- 14PiracicabaSão Paulo22.4
- 15ItabiraMinas Gerais22.4
- 16BetimMinas Gerais22.3
- 17São PauloSão Paulo22.2
- 18Santo AndréSão Paulo22.2
- 19ItaquaquecetubaSão Paulo22.0
- 20Ferraz de VasconcelosSão Paulo19.9
+ 17 more cities, the next at 19.9 µg/m³
Not counted on this day, too few days measured: Tubarão since 2 Sep 2024 and Timóteo since 22 Aug 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.