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 14 Jul 2024: Rio Claro 25.4 µg/m³, Ferraz de Vasconcelos 24.3 µg/m³ and São José do Rio Preto 23.3 µg/m³.
- 1Rio ClaroSão Paulo25.4
- 2Ferraz de VasconcelosSão Paulo24.3
- 3São José do Rio PretoSão Paulo23.3
- 4Ribeirão PretoSão Paulo22.3
- 5CampinasSão Paulo21.7
- 6ItaquaquecetubaSão Paulo21.5
- 7São PauloSão Paulo21.3
- 8JundiaíSão Paulo20.4
- 9Rio de JaneiroRio de Janeiro20.0
- 10BetimMinas Gerais20.0
- 11LimeiraSão Paulo19.7
- 12CongonhasMinas Gerais19.7
- 13PaulíniaSão Paulo19.3
- 14PiracicabaSão Paulo19.2
- 15ItabiraMinas Gerais17.1
- 16Coronel FabricianoMinas Gerais16.9
- 17AraucáriaParaná16.0
- 18GuaratinguetáSão Paulo15.9
- 19CuritibaParaná15.7
- 20São José dos CamposSão Paulo15.5
+ 11 more cities, the next at 15.4 µg/m³
Not counted on this day, too few days measured: Timóteo since 10 Jul 2024, Serra since 10 Jul 2024, São Luís since 9 Jul 2024 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.