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 9 Jun 2025: Nova União 20.5 µg/m³, Rio Claro 18.3 µg/m³ and Betim 16.1 µg/m³.
- 1Nova UniãoMinas Gerais20.5
- 2Rio ClaroSão Paulo18.3
- 3BetimMinas Gerais16.1
- 4Coronel FabricianoMinas Gerais15.9
- 5Ferraz de VasconcelosSão Paulo15.6
- 6TimóteoMinas Gerais15.3
- 7ItaquaquecetubaSão Paulo14.3
- 8São PauloSão Paulo14.2
- 9São José do Rio PretoSão Paulo13.2
- 10Santo AndréSão Paulo13.1
- 11Foz do IguaçuParaná13.1
- 12ColomboParaná13.0
- 13Ribeirão PretoSão Paulo12.8
- 14LimeiraSão Paulo12.4
- 15JundiaíSão Paulo12.4
- 16SantosSão Paulo12.2
- 17Francisco BeltrãoParaná12.1
- 18BauruSão Paulo12.1
- 19GuarapuavaParaná12.0
- 20PiracicabaSão Paulo11.9
+ 23 more cities, the next at 11.9 µg/m³
Not counted on this day, too few days measured: Serra since 6 Jun 2025, União da Vitória since 5 Jun 2025, Barra Longa since 16 May 2025 and 5 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.