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 20 Jun 2023: Ferraz de Vasconcelos 20.0 µg/m³, Rio Claro 18.7 µg/m³ and Timóteo 17.8 µg/m³.
- 1Ferraz de VasconcelosSão Paulo20.0
- 2Rio ClaroSão Paulo18.7
- 3TimóteoMinas Gerais17.8
- 4AçailândiaMaranhão17.4
- 5ItaquaquecetubaSão Paulo17.2
- 6Santo AndréSão Paulo16.9
- 7Coronel FabricianoMinas Gerais16.9
- 8São PauloSão Paulo15.9
- 9Ribeirão PretoSão Paulo14.7
- 10Nova UniãoMinas Gerais14.5
- 11CampinasSão Paulo14.5
- 12CuritibaParaná14.3
- 13AraucáriaParaná14.0
- 14SantosSão Paulo13.7
- 15IpatingaMinas Gerais13.6
- 16CongonhasMinas Gerais13.3
- 17Belo HorizonteMinas Gerais13.0
- 18PaulíniaSão Paulo12.7
- 19PiracicabaSão Paulo12.5
- 20São José dos CamposSão Paulo12.2
+ 11 more cities, the next at 11.8 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 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.