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 Jul 2025: Nova União 20.8 µg/m³, Rio Claro 19.6 µg/m³ and Ferraz de Vasconcelos 16.8 µg/m³.
- 1Nova UniãoMinas Gerais20.8
- 2Rio ClaroSão Paulo19.6
- 3Ferraz de VasconcelosSão Paulo16.8
- 4TimóteoMinas Gerais15.5
- 5Santo AndréSão Paulo15.5
- 6ColomboParaná15.4
- 7BetimMinas Gerais15.3
- 8Coronel FabricianoMinas Gerais15.1
- 9Ribeirão PretoSão Paulo15.0
- 10ItaquaquecetubaSão Paulo15.0
- 11São PauloSão Paulo14.2
- 12JundiaíSão Paulo13.9
- 13São José do Rio PretoSão Paulo13.7
- 14LimeiraSão Paulo13.7
- 15Foz do IguaçuParaná13.7
- 16ItabiraMinas Gerais13.4
- 17SantosSão Paulo12.9
- 18AraucáriaParaná12.8
- 19TubarãoSanta Catarina12.0
- 20Francisco BeltrãoParaná11.9
+ 21 more cities, the next at 11.9 µg/m³
Not counted on this day, too few days measured: Cubatão since 1 Jul 2025, Ibirité since 25 Jun 2025, Dias d'Ávila since 23 Jun 2025 and 4 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.