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 Feb 2025: Nova União 17.0 µg/m³, Santo André 13.2 µg/m³ and Timóteo 13.1 µg/m³.
- 1Nova UniãoMinas Gerais17.0
- 2Santo AndréSão Paulo13.2
- 3TimóteoMinas Gerais13.1
- 4Ferraz de VasconcelosSão Paulo13.0
- 5SerraEspírito Santo12.4
- 6Coronel FabricianoMinas Gerais11.6
- 7Foz do IguaçuParaná11.5
- 8BetimMinas Gerais11.2
- 9São PauloSão Paulo11.1
- 10ColomboParaná11.0
- 11Rio ClaroSão Paulo10.9
- 12ItabiraMinas Gerais10.8
- 13SantosSão Paulo10.7
- 14ItaquaquecetubaSão Paulo10.7
- 15IbiritéMinas Gerais10.5
- 16Duque de CaxiasRio de Janeiro10.4
- 17CongonhasMinas Gerais10.3
- 18JundiaíSão Paulo10.0
- 19Rio de JaneiroRio de Janeiro9.9
- 20GuarapuavaParaná9.7
+ 22 more cities, the next at 9.5 µg/m³
Not counted on this day, too few days measured: Presidente Prudente since 17 Jan 2025, São Luís since 7 Jan 2025, São Félix do Xingu since 30 Dec 2024 and Cubatão since 29 Dec 2024.
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.