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 5 Jan 2026: Guarapari 28.3 µg/m³, Anchieta 27.9 µg/m³ and Nilópolis 13.3 µg/m³.
- 1GuarapariEspírito Santo28.3
- 2AnchietaEspírito Santo27.9
- 3NilópolisRio de Janeiro13.3
- 4Ferraz de VasconcelosSão Paulo11.9
- 5JundiaíSão Paulo11.7
- 6AraucáriaParaná11.6
- 7TubarãoSanta Catarina11.4
- 8CubatãoSão Paulo10.7
- 9SantosSão Paulo10.5
- 10São PauloSão Paulo10.1
- 11ParanaguáParaná10.1
- 12GuarapuavaParaná9.6
- 13CampinasSão Paulo9.5
- 14Rio ClaroSão Paulo9.3
- 15Duque de CaxiasRio de Janeiro9.3
- 16Ponta GrossaParaná9.0
- 17ItaquaquecetubaSão Paulo8.8
- 18CuritibaParaná8.7
- 19PaulíniaSão Paulo8.5
- 20São José dos CamposSão Paulo8.3
+ 12 more cities, the next at 8.3 µg/m³
Not counted on this day, too few days measured: Congonhas since 3 Jan 2026, Timóteo since 2 Jan 2026, Londrina since 2 Jan 2026 and 16 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.