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 21 Dec 2024: São Luís 23.5 µg/m³, Coronel Fabriciano 17.1 µg/m³ and Dias d'Ávila 13.8 µg/m³.
- 1São LuísMaranhão23.5
- 2Coronel FabricianoMinas Gerais17.1
- 3Dias d'ÁvilaBahia13.8
- 4TimóteoMinas Gerais12.7
- 5SerraEspírito Santo12.7
- 6ItaquaquecetubaSão Paulo11.8
- 7BetimMinas Gerais11.3
- 8Nova UniãoMinas Gerais10.8
- 9Rio ClaroSão Paulo10.8
- 10Ferraz de VasconcelosSão Paulo10.6
- 11São PauloSão Paulo10.3
- 12CampinasSão Paulo10.3
- 13IbiritéMinas Gerais10.2
- 14Santo AndréSão Paulo10.0
- 15CubatãoSão Paulo9.9
- 16ItabiraMinas Gerais9.8
- 17LimeiraSão Paulo9.4
- 18Ribeirão PretoSão Paulo9.1
- 19SantosSão Paulo8.7
- 20São José do Rio PretoSão Paulo8.6
+ 16 more cities, the next at 8.5 µg/m³
Not counted on this day, too few days measured: Jundiaí since 20 Dec 2024, Curitiba since 9 Dec 2024, Araucária since 9 Dec 2024 and 7 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, 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.