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 17 Sep 2025: São José do Rio Preto 26.5 µg/m³, Nova União 24.2 µg/m³ and Ribeirão Preto 23.3 µg/m³.
- 1São José do Rio PretoSão Paulo26.5
- 2Nova UniãoMinas Gerais24.2
- 3Ribeirão PretoSão Paulo23.3
- 4Rio ClaroSão Paulo22.9
- 5LimeiraSão Paulo20.3
- 6PiracicabaSão Paulo19.1
- 7PaulíniaSão Paulo17.8
- 8ParacatuMinas Gerais16.9
- 9BauruSão Paulo16.7
- 10TimóteoMinas Gerais16.4
- 11JundiaíSão Paulo16.3
- 12BetimMinas Gerais16.0
- 13Ferraz de VasconcelosSão Paulo15.8
- 14GuarapariEspírito Santo15.7
- 15São PauloSão Paulo15.6
- 16ItaquaquecetubaSão Paulo15.3
- 17Três LagoasMato Grosso do Sul15.0
- 18GuarapuavaParaná14.8
- 19ItabiraMinas Gerais14.4
- 20Coronel FabricianoMinas Gerais14.3
+ 27 more cities, the next at 14.1 µg/m³
Not counted on this day, too few days measured: Guaratinguetá since 8 Sep 2025, Tubarão since 7 Sep 2025, Colombo since 16 Aug 2025 and Santo André since 31 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, 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.