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 29 Mar 2023: Timóteo 15.3 µg/m³, São Paulo 15.2 µg/m³ and Coronel Fabriciano 13.5 µg/m³.
- 1TimóteoMinas Gerais15.3
- 2São PauloSão Paulo15.2
- 3Coronel FabricianoMinas Gerais13.5
- 4Nova UniãoMinas Gerais11.8
- 5CongonhasMinas Gerais11.3
- 6AraucáriaParaná11.3
- 7ItaquaquecetubaSão Paulo10.8
- 8São LuísMaranhão10.5
- 9Belo HorizonteMinas Gerais9.9
- 10TubarãoSanta Catarina9.6
- 11PiracicabaSão Paulo9.4
- 12IpatingaMinas Gerais8.8
- 13CuritibaParaná7.9
- 14BetimMinas Gerais7.3
- 15ItabiraMinas Gerais7.1
- 16Barra LongaMinas Gerais7.1
- 17Dias d'ÁvilaBahia7.0
- 18IbiritéMinas Gerais6.3
- 19Conceição do Mato DentroMinas Gerais5.1
- 20BrumadinhoMinas Gerais3.1
+ 1 more city, at 2.1 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 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.