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 Oct 2025: Guarapari 22.5 µg/m³, Anchieta 19.6 µg/m³ and Ribeirão Preto 17.4 µg/m³.
- 1GuarapariEspírito Santo22.5
- 2AnchietaEspírito Santo19.6
- 3Ribeirão PretoSão Paulo17.4
- 4Rio ClaroSão Paulo17.3
- 5ParacatuMinas Gerais17.0
- 6BauruSão Paulo17.0
- 7LimeiraSão Paulo15.7
- 8JundiaíSão Paulo15.5
- 9BetimMinas Gerais15.0
- 10TimóteoMinas Gerais14.6
- 11São PauloSão Paulo14.5
- 12PaulíniaSão Paulo14.5
- 13PiracicabaSão Paulo14.4
- 14Ferraz de VasconcelosSão Paulo13.9
- 15Três LagoasMato Grosso do Sul13.8
- 16TubarãoSanta Catarina13.3
- 17ItaquaquecetubaSão Paulo13.2
- 18AraucáriaParaná12.7
- 19IbiritéMinas Gerais12.6
- 20ColomboParaná12.4
+ 26 more cities, the next at 12.2 µg/m³
Not counted on this day, too few days measured: São José do Rio Preto since 17 Oct 2025, Campinas since 29 Sep 2025, Nova União since 22 Sep 2025 and Foz do Iguaçu since 21 Sep 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.