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 28 Jan 2023: Timóteo 12.3 µg/m³, São Paulo 11.9 µg/m³ and Paulínia 11.2 µg/m³.
- 1TimóteoMinas Gerais12.3
- 2São PauloSão Paulo11.9
- 3PaulíniaSão Paulo11.2
- 4TubarãoSanta Catarina9.9
- 5CampinasSão Paulo9.2
- 6ItaquaquecetubaSão Paulo8.9
- 7Belo HorizonteMinas Gerais8.8
- 8Rio ClaroSão Paulo8.5
- 9Nova UniãoMinas Gerais8.2
- 10CuritibaParaná7.6
- 11TaubatéSão Paulo7.5
- 12Barra LongaMinas Gerais7.1
- 13Ribeirão PretoSão Paulo6.9
- 14São José dos CamposSão Paulo6.6
- 15IpatingaMinas Gerais6.6
- 16PiracicabaSão Paulo6.5
- 17CongonhasMinas Gerais6.4
- 18São José do Rio PretoSão Paulo6.2
- 19IbiritéMinas Gerais5.2
- 20Conceição do Mato DentroMinas Gerais4.9
+ 3 more cities, the next at 4.8 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 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.