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 Sep 2024: Ribeirão Preto 67.0 µg/m³, São José do Rio Preto 48.1 µg/m³ and Rio Claro 47.4 µg/m³.
- 1Ribeirão PretoSão Paulo67.0
- 2São José do Rio PretoSão Paulo48.1
- 3Rio ClaroSão Paulo47.4
- 4Ferraz de VasconcelosSão Paulo41.9
- 5ItaquaquecetubaSão Paulo41.8
- 6CampinasSão Paulo41.2
- 7JundiaíSão Paulo40.6
- 8São PauloSão Paulo40.1
- 9PaulíniaSão Paulo38.1
- 10LimeiraSão Paulo37.4
- 11BetimMinas Gerais36.9
- 12PiracicabaSão Paulo34.8
- 13AraucáriaParaná32.5
- 14Nova UniãoMinas Gerais32.2
- 15CongonhasMinas Gerais32.2
- 16TaubatéSão Paulo32.0
- 17CuritibaParaná31.6
- 18São José dos CamposSão Paulo29.1
- 19GuaratinguetáSão Paulo28.4
- 20Belo HorizonteMinas Gerais28.2
+ 12 more cities, the next at 25.6 µg/m³
Not counted on this day, too few days measured: Tubarão since 2 Sep 2024, Presidente Prudente 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.