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 1 Apr 2023: Timóteo 15.8 µg/m³, São Paulo 15.2 µg/m³ and Coronel Fabriciano 13.8 µg/m³.
- 1TimóteoMinas Gerais15.8
- 2São PauloSão Paulo15.2
- 3Coronel FabricianoMinas Gerais13.8
- 4Nova UniãoMinas Gerais12.6
- 5AraucáriaParaná11.4
- 6ItaquaquecetubaSão Paulo11.2
- 7CongonhasMinas Gerais11.2
- 8Belo HorizonteMinas Gerais10.1
- 9PiracicabaSão Paulo9.6
- 10São LuísMaranhão9.5
- 11TubarãoSanta Catarina9.5
- 12IpatingaMinas Gerais8.8
- 13CuritibaParaná8.4
- 14BetimMinas Gerais7.8
- 15ItabiraMinas Gerais7.6
- 16Dias d'ÁvilaBahia7.0
- 17Barra LongaMinas Gerais7.0
- 18IbiritéMinas Gerais6.7
- 19Conceição do Mato DentroMinas Gerais5.2
- 20BrumadinhoMinas Gerais3.2
+ 2 more cities, the next at 3.2 µg/m³
Not counted on this day, too few days measured: Canaã dos Carajás since 11 Mar 2023, Taubaté since 5 Feb 2023, São José dos Campos since 5 Feb 2023 and 8 more cities. 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.