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 20 Apr 2025: Nova União 18.3 µg/m³, Foz do Iguaçu 14.0 µg/m³ and Rio Claro 13.2 µg/m³.
- 1Nova UniãoMinas Gerais18.3
- 2Foz do IguaçuParaná14.0
- 3Rio ClaroSão Paulo13.2
- 4Coronel FabricianoMinas Gerais13.1
- 5CubatãoSão Paulo12.3
- 6Ferraz de VasconcelosSão Paulo11.8
- 7São PauloSão Paulo11.7
- 8BetimMinas Gerais11.5
- 9TimóteoMinas Gerais11.2
- 10Santo AndréSão Paulo11.0
- 11SantosSão Paulo10.6
- 12ItabiraMinas Gerais10.6
- 13JundiaíSão Paulo10.3
- 14ItaquaquecetubaSão Paulo10.3
- 15Belo HorizonteMinas Gerais10.2
- 16LimeiraSão Paulo10.0
- 17IbiritéMinas Gerais9.7
- 18MaringáParaná9.6
- 19AraucáriaParaná9.6
- 20PiracicabaSão Paulo9.4
+ 22 more cities, the next at 9.3 µg/m³
Not counted on this day, too few days measured: Duque de Caxias since 19 Apr 2025, Londrina since 17 Apr 2025, Paulínia since 16 Apr 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, 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.