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 13 Aug 2024: Rio Claro 27.8 µg/m³, Ferraz de Vasconcelos 25.8 µg/m³ and Itaquaquecetuba 25.2 µg/m³.
- 1Rio ClaroSão Paulo27.8
- 2Ferraz de VasconcelosSão Paulo25.8
- 3ItaquaquecetubaSão Paulo25.2
- 4São PauloSão Paulo23.2
- 5Ribeirão PretoSão Paulo22.2
- 6CampinasSão Paulo22.0
- 7LimeiraSão Paulo21.0
- 8CuritibaParaná20.7
- 9AraucáriaParaná20.1
- 10PaulíniaSão Paulo19.4
- 11PiracicabaSão Paulo18.4
- 12CongonhasMinas Gerais18.3
- 13SantosSão Paulo17.3
- 14Rio de JaneiroRio de Janeiro17.2
- 15TubarãoSanta Catarina16.7
- 16São José dos CamposSão Paulo16.2
- 17ItabiraMinas Gerais15.9
- 18GuaratinguetáSão Paulo15.9
- 19BetimMinas Gerais15.9
- 20TaubatéSão Paulo15.7
+ 13 more cities, the next at 15.4 µg/m³
Not counted on this day, too few days measured: Jundiaí since 9 Aug 2024, São José do Rio Preto since 30 Jul 2024, São Luís since 9 Jul 2024 and 2 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.