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 19 Jul 2025: Rio Claro 21.7 µg/m³, Nova União 21.1 µg/m³ and Ferraz de Vasconcelos 20.1 µg/m³.
- 1Rio ClaroSão Paulo21.7
- 2Nova UniãoMinas Gerais21.1
- 3Ferraz de VasconcelosSão Paulo20.1
- 4ColomboParaná19.4
- 5ItaquaquecetubaSão Paulo18.2
- 6Santo AndréSão Paulo17.5
- 7JundiaíSão Paulo17.4
- 8Foz do IguaçuParaná17.1
- 9BetimMinas Gerais17.0
- 10São PauloSão Paulo16.8
- 11Ribeirão PretoSão Paulo16.2
- 12LimeiraSão Paulo15.9
- 13Coronel FabricianoMinas Gerais15.8
- 14AraucáriaParaná15.6
- 15TubarãoSanta Catarina15.3
- 16TimóteoMinas Gerais15.2
- 17São José do Rio PretoSão Paulo14.5
- 18PiracicabaSão Paulo14.2
- 19CuritibaParaná14.1
- 20ItabiraMinas Gerais13.7
+ 21 more cities, the next at 13.3 µg/m³
Not counted on this day, too few days measured: Guaratinguetá since 13 Jul 2025, Cubatão since 1 Jul 2025, Dias d'Ávila since 23 Jun 2025 and 4 more cities.
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.