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 11 Nov 2024: São Luís 23.6 µg/m³, Foz do Iguaçu 13.7 µg/m³ and Rio Claro 12.9 µg/m³.
- 1São LuísMaranhão23.6
- 2Foz do IguaçuParaná13.7
- 3Rio ClaroSão Paulo12.9
- 4SerraEspírito Santo12.5
- 5Coronel FabricianoMinas Gerais12.4
- 6Dias d'ÁvilaBahia11.5
- 7SantosSão Paulo10.9
- 8ItabiraMinas Gerais10.6
- 9AraucáriaParaná10.6
- 10São PauloSão Paulo10.4
- 11LimeiraSão Paulo10.4
- 12São José do Rio PretoSão Paulo10.3
- 13Santo AndréSão Paulo10.2
- 14Ferraz de VasconcelosSão Paulo10.1
- 15Nova UniãoMinas Gerais9.8
- 16JundiaíSão Paulo9.7
- 17BauruSão Paulo9.5
- 18Ribeirão PretoSão Paulo9.4
- 19ItaquaquecetubaSão Paulo9.2
- 20Conceição do Mato DentroMinas Gerais9.1
+ 14 more cities, the next at 9.1 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 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.