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 Feb 2025: Nova União 17.6 µg/m³, Timóteo 13.1 µg/m³ and Serra 12.3 µg/m³.
- 1Nova UniãoMinas Gerais17.6
- 2TimóteoMinas Gerais13.1
- 3SerraEspírito Santo12.3
- 4Coronel FabricianoMinas Gerais11.7
- 5IbiritéMinas Gerais11.0
- 6BetimMinas Gerais10.6
- 7SantosSão Paulo10.3
- 8Santo AndréSão Paulo10.2
- 9Rio ClaroSão Paulo10.2
- 10Ferraz de VasconcelosSão Paulo10.2
- 11ItabiraMinas Gerais9.9
- 12Duque de CaxiasRio de Janeiro9.7
- 13Rio de JaneiroRio de Janeiro9.5
- 14GuarapuavaParaná9.5
- 15CongonhasMinas Gerais9.4
- 16São PauloSão Paulo9.3
- 17ItaquaquecetubaSão Paulo8.8
- 18LimeiraSão Paulo8.6
- 19CamaçariBahia8.6
- 20Dias d'ÁvilaBahia8.4
+ 19 more cities, the next at 8.3 µg/m³
Not counted on this day, too few days measured: Candeias since 8 Feb 2025, Presidente Prudente since 17 Jan 2025, São Luís since 7 Jan 2025 and 3 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.