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 19 Jun 2025: Nova União 22.1 µg/m³, Rio Claro 19.9 µg/m³ and Ferraz de Vasconcelos 16.9 µg/m³.
- 1Nova UniãoMinas Gerais22.1
- 2Rio ClaroSão Paulo19.9
- 3Ferraz de VasconcelosSão Paulo16.9
- 4BetimMinas Gerais16.5
- 5Coronel FabricianoMinas Gerais16.3
- 6TimóteoMinas Gerais15.9
- 7Santo AndréSão Paulo15.2
- 8ItaquaquecetubaSão Paulo15.2
- 9São PauloSão Paulo15.0
- 10São José do Rio PretoSão Paulo14.4
- 11ColomboParaná14.2
- 12Ribeirão PretoSão Paulo13.8
- 13SantosSão Paulo13.4
- 14JundiaíSão Paulo13.1
- 15LimeiraSão Paulo12.8
- 16ItabiraMinas Gerais12.7
- 17Foz do IguaçuParaná12.4
- 18BauruSão Paulo12.4
- 19GuarapuavaParaná12.2
- 20Francisco BeltrãoParaná12.0
+ 26 more cities, the next at 12.0 µg/m³
Not counted on this day, too few days measured: Duque de Caxias since 19 Jun 2025, Serra since 6 Jun 2025, União da Vitória since 5 Jun 2025 and Três Lagoas since 10 May 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.