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 27 Jun 2023: Ferraz de Vasconcelos 20.9 µg/m³, Santo André 20.5 µg/m³ and Itaquaquecetuba 19.3 µg/m³.
- 1Ferraz de VasconcelosSão Paulo20.9
- 2Santo AndréSão Paulo20.5
- 3ItaquaquecetubaSão Paulo19.3
- 4São PauloSão Paulo19.0
- 5Rio ClaroSão Paulo18.9
- 6AçailândiaMaranhão18.0
- 7TimóteoMinas Gerais17.5
- 8Coronel FabricianoMinas Gerais16.6
- 9CampinasSão Paulo16.1
- 10SantosSão Paulo15.9
- 11Ribeirão PretoSão Paulo15.4
- 12CuritibaParaná15.4
- 13Nova UniãoMinas Gerais15.3
- 14AraucáriaParaná14.3
- 15CongonhasMinas Gerais14.0
- 16São José dos CamposSão Paulo13.6
- 17BetimMinas Gerais13.6
- 18PaulíniaSão Paulo13.4
- 19IpatingaMinas Gerais13.2
- 20GuaratinguetáSão Paulo13.1
+ 11 more cities, the next at 12.8 µg/m³
Not counted on this day, too few days measured: Tubarão since 15 Jun 2023, Ibirité since 14 Jun 2023, Limeira since 10 Jun 2023 and Jundiaí since 9 Jun 2023.
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.