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 21 Nov 2024: São Luís 22.8 µg/m³, Foz do Iguaçu 13.6 µg/m³ and Coronel Fabriciano 13.3 µg/m³.
- 1São LuísMaranhão22.8
- 2Foz do IguaçuParaná13.6
- 3Coronel FabricianoMinas Gerais13.3
- 4Rio ClaroSão Paulo12.5
- 5TimóteoMinas Gerais11.9
- 6Dias d'ÁvilaBahia11.0
- 7SerraEspírito Santo10.9
- 8SantosSão Paulo10.2
- 9Santo AndréSão Paulo10.1
- 10AraucáriaParaná10.0
- 11São PauloSão Paulo9.9
- 12LimeiraSão Paulo9.9
- 13ItaquaquecetubaSão Paulo9.4
- 14São José do Rio PretoSão Paulo9.1
- 15JundiaíSão Paulo9.1
- 16Ferraz de VasconcelosSão Paulo9.1
- 17ItabiraMinas Gerais8.8
- 18CampinasSão Paulo8.8
- 19CamaçariBahia8.7
- 20BauruSão Paulo8.6
+ 16 more cities, the next at 8.5 µg/m³
Not counted on this day, too few days measured: Guarapuava since 10 Nov 2024, Belo Horizonte since 7 Nov 2024, Presidente Prudente since 6 Nov 2024 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.