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 Sep 2025: Nova União 21.9 µg/m³, São José do Rio Preto 21.0 µg/m³ and Rio Claro 20.4 µg/m³.
- 1Nova UniãoMinas Gerais21.9
- 2São José do Rio PretoSão Paulo21.0
- 3Rio ClaroSão Paulo20.4
- 4Ribeirão PretoSão Paulo20.0
- 5GuaratinguetáSão Paulo18.3
- 6LimeiraSão Paulo18.1
- 7PaulíniaSão Paulo16.7
- 8PiracicabaSão Paulo16.6
- 9GuarapuavaParaná16.2
- 10JundiaíSão Paulo16.1
- 11Foz do IguaçuParaná16.0
- 12TimóteoMinas Gerais15.5
- 13São PauloSão Paulo15.4
- 14BauruSão Paulo15.4
- 15Ferraz de VasconcelosSão Paulo15.3
- 16Coronel FabricianoMinas Gerais15.0
- 17ItaquaquecetubaSão Paulo14.8
- 18BetimMinas Gerais14.5
- 19AraucáriaParaná14.5
- 20ItabiraMinas Gerais14.4
+ 29 more cities, the next at 14.2 µg/m³
Not counted on this day, too few days measured: 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 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.