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 31 Jan 2023: Timóteo 12.5 µg/m³, São Paulo 11.2 µg/m³ and Paulínia 10.9 µg/m³.
- 1TimóteoMinas Gerais12.5
- 2São PauloSão Paulo11.2
- 3PaulíniaSão Paulo10.9
- 4TubarãoSanta Catarina10.3
- 5Santo AndréSão Paulo10.0
- 6CampinasSão Paulo8.9
- 7Nova UniãoMinas Gerais8.8
- 8ItaquaquecetubaSão Paulo8.5
- 9Belo HorizonteMinas Gerais8.5
- 10Rio ClaroSão Paulo8.3
- 11JundiaíSão Paulo7.8
- 12GuaratinguetáSão Paulo7.7
- 13CuritibaParaná7.7
- 14TaubatéSão Paulo7.2
- 15Barra LongaMinas Gerais7.1
- 16Ribeirão PretoSão Paulo6.9
- 17IpatingaMinas Gerais6.5
- 18CongonhasMinas Gerais6.5
- 19São José dos CamposSão Paulo6.3
- 20PiracicabaSão Paulo6.3
+ 7 more cities, the next at 6.1 µg/m³
Days missing from the source archive fall in this window, so fewer countries are counted.
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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.