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 10 May 2025: Nova União 17.7 µg/m³, Foz do Iguaçu 15.9 µg/m³ and Rio Claro 14.9 µg/m³.
- 1Nova UniãoMinas Gerais17.7
- 2Foz do IguaçuParaná15.9
- 3Rio ClaroSão Paulo14.9
- 4Coronel FabricianoMinas Gerais14.0
- 5BetimMinas Gerais13.1
- 6São PauloSão Paulo12.8
- 7TimóteoMinas Gerais12.5
- 8Ferraz de VasconcelosSão Paulo12.3
- 9Santo AndréSão Paulo12.1
- 10LimeiraSão Paulo11.6
- 11AraucáriaParaná11.4
- 12JundiaíSão Paulo11.3
- 13SantosSão Paulo11.2
- 14ItaquaquecetubaSão Paulo11.1
- 15CubatãoSão Paulo10.8
- 16ItabiraMinas Gerais10.7
- 17PiracicabaSão Paulo10.4
- 18Belo HorizonteMinas Gerais10.3
- 19BauruSão Paulo10.3
- 20São José do Rio PretoSão Paulo10.1
+ 20 more cities, the next at 10.1 µg/m³
Not counted on this day, too few days measured: Três Lagoas since 10 May 2025, Tubarão since 9 May 2025, Ponta Grossa since 9 May 2025 and 8 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.