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 8 Aug 2025: Rio Claro 25.6 µg/m³, Colombo 24.4 µg/m³ and Ferraz de Vasconcelos 22.7 µg/m³.
- 1Rio ClaroSão Paulo25.6
- 2ColomboParaná24.4
- 3Ferraz de VasconcelosSão Paulo22.7
- 4JundiaíSão Paulo22.1
- 5ItaquaquecetubaSão Paulo21.9
- 6São PauloSão Paulo20.5
- 7Nova UniãoMinas Gerais20.2
- 8AraucáriaParaná19.8
- 9LimeiraSão Paulo18.9
- 10Foz do IguaçuParaná18.4
- 11São José do Rio PretoSão Paulo17.9
- 12PaulíniaSão Paulo17.7
- 13PiracicabaSão Paulo17.5
- 14Ribeirão PretoSão Paulo17.1
- 15BetimMinas Gerais16.5
- 16Coronel FabricianoMinas Gerais16.4
- 17CuritibaParaná16.2
- 18TimóteoMinas Gerais16.1
- 19GuarapuavaParaná16.0
- 20TubarãoSanta Catarina15.8
+ 26 more cities, the next at 15.8 µg/m³
Not counted on this day, too few days measured: Santo André since 31 Jul 2025, Portalegre since 25 Jul 2025 and Guaratinguetá since 13 Jul 2025.
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.