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 15 Apr 2024: São Luís 14.4 µg/m³, Campinas 14.2 µg/m³ and Rio Claro 13.7 µg/m³.
- 1São LuísMaranhão14.4
- 2CampinasSão Paulo14.2
- 3Rio ClaroSão Paulo13.7
- 4Santo AndréSão Paulo13.0
- 5São PauloSão Paulo12.9
- 6Ferraz de VasconcelosSão Paulo12.4
- 7JundiaíSão Paulo11.7
- 8SantosSão Paulo11.4
- 9PiracicabaSão Paulo11.2
- 10PaulíniaSão Paulo11.1
- 11GuaratinguetáSão Paulo10.8
- 12CongonhasMinas Gerais10.3
- 13São José dos CamposSão Paulo9.8
- 14TaubatéSão Paulo9.4
- 15Conceição do Mato DentroMinas Gerais9.2
- 16TimóteoMinas Gerais8.9
- 17ParacatuMinas Gerais8.7
- 18Belo HorizonteMinas Gerais8.6
- 19SerraEspírito Santo8.5
- 20Nova UniãoMinas Gerais8.4
+ 8 more cities, the next at 8.4 µg/m³
Not counted on this day, too few days measured: Curitiba since 14 Apr 2024, Araucária since 14 Apr 2024, Rio de Janeiro since 13 Apr 2024 and 8 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.