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 22 Mar 2023: São Paulo 15.3 µg/m³, Congonhas 11.2 µg/m³ and Nova União 11.0 µg/m³.
- 1São PauloSão Paulo15.3
- 2CongonhasMinas Gerais11.2
- 3Nova UniãoMinas Gerais11.0
- 4São LuísMaranhão10.9
- 5AraucáriaParaná10.5
- 6ItaquaquecetubaSão Paulo10.0
- 7TubarãoSanta Catarina9.4
- 8Belo HorizonteMinas Gerais9.3
- 9PiracicabaSão Paulo8.6
- 10IpatingaMinas Gerais8.2
- 11CuritibaParaná7.6
- 12Dias d'ÁvilaBahia7.2
- 13Barra LongaMinas Gerais6.8
- 14ItabiraMinas Gerais6.5
- 15BetimMinas Gerais6.5
- 16Conceição do Mato DentroMinas Gerais4.8
- 17BrumadinhoMinas Gerais3.2
- 18AçailândiaMaranhão2.0
Not counted on this day, too few days measured: Ibirité since 22 Mar 2023, Timóteo since 17 Mar 2023, Canaã dos Carajás since 11 Mar 2023 and 11 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.