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 2 Mar 2023: Timóteo 14.2 µg/m³, São Paulo 13.2 µg/m³ and Congonhas 11.0 µg/m³.
- 1TimóteoMinas Gerais14.2
- 2São PauloSão Paulo13.2
- 3CongonhasMinas Gerais11.0
- 4São LuísMaranhão10.6
- 5Belo HorizonteMinas Gerais10.1
- 6Nova UniãoMinas Gerais9.3
- 7IpatingaMinas Gerais9.0
- 8ItaquaquecetubaSão Paulo8.5
- 9Barra LongaMinas Gerais8.2
- 10Dias d'ÁvilaBahia7.7
- 11PiracicabaSão Paulo7.4
- 12IbiritéMinas Gerais7.4
- 13ItabiraMinas Gerais6.3
- 14BetimMinas Gerais6.0
- 15Conceição do Mato DentroMinas Gerais5.2
- 16Canaã dos CarajásPará3.4
- 17BrumadinhoMinas Gerais3.1
Not counted on this day, too few days measured: Curitiba since 20 Feb 2023, Araucária since 20 Feb 2023, Coronel Fabriciano since 17 Feb 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, 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.