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 16 Nov 2025: Guarapari 27.3 µg/m³, Nova União 26.1 µg/m³ and Anchieta 19.6 µg/m³.
- 1GuarapariEspírito Santo27.3
- 2Nova UniãoMinas Gerais26.1
- 3AnchietaEspírito Santo19.6
- 4São LuísMaranhão17.9
- 5Rio ClaroSão Paulo13.8
- 6TimóteoMinas Gerais13.3
- 7GuarapuavaParaná12.5
- 8CampinasSão Paulo12.3
- 9TubarãoSanta Catarina12.2
- 10PaulíniaSão Paulo12.2
- 11GuaratinguetáSão Paulo12.2
- 12JundiaíSão Paulo11.7
- 13Ribas do Rio PardoMato Grosso do Sul11.6
- 14BetimMinas Gerais11.5
- 15Coronel FabricianoMinas Gerais11.2
- 16São PauloSão Paulo11.0
- 17ItabiraMinas Gerais10.8
- 18AraucáriaParaná10.7
- 19LimeiraSão Paulo10.6
- 20Ferraz de VasconcelosSão Paulo10.6
+ 21 more cities, the next at 10.5 µg/m³
Not counted on this day, too few days measured: Colombo since 16 Nov 2025, Londrina since 10 Nov 2025, Camaçari since 5 Nov 2025 and 7 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.