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 7 Oct 2025: São José do Rio Preto 25.9 µg/m³, Ribeirão Preto 22.5 µg/m³ and Rio Claro 21.9 µg/m³.
- 1São José do Rio PretoSão Paulo25.9
- 2Ribeirão PretoSão Paulo22.5
- 3Rio ClaroSão Paulo21.9
- 4GuarapariEspírito Santo19.6
- 5LimeiraSão Paulo19.5
- 6ParacatuMinas Gerais18.4
- 7PiracicabaSão Paulo18.3
- 8BauruSão Paulo18.3
- 9PaulíniaSão Paulo17.1
- 10BetimMinas Gerais17.1
- 11JundiaíSão Paulo17.0
- 12AnchietaEspírito Santo16.8
- 13Três LagoasMato Grosso do Sul16.0
- 14TimóteoMinas Gerais15.9
- 15São PauloSão Paulo15.6
- 16Ferraz de VasconcelosSão Paulo15.5
- 17ItaquaquecetubaSão Paulo15.4
- 18CongonhasMinas Gerais14.1
- 19IbiritéMinas Gerais13.6
- 20Belo HorizonteMinas Gerais13.4
+ 26 more cities, the next at 13.4 µg/m³
Not counted on this day, too few days measured: Campinas since 29 Sep 2025, Londrina since 26 Sep 2025, Nova União since 22 Sep 2025 and 2 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 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.