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 26 Mar 2024: São Luís 17.0 µg/m³, Campinas 12.1 µg/m³ and Rio Claro 11.8 µg/m³.
- 1São LuísMaranhão17.0
- 2CampinasSão Paulo12.1
- 3Rio ClaroSão Paulo11.8
- 4Ferraz de VasconcelosSão Paulo11.5
- 5São PauloSão Paulo11.2
- 6JundiaíSão Paulo11.2
- 7SerraEspírito Santo10.9
- 8SantosSão Paulo10.8
- 9VitóriaEspírito Santo10.3
- 10TubarãoSanta Catarina10.3
- 11CongonhasMinas Gerais10.2
- 12Belo HorizonteMinas Gerais9.9
- 13PaulíniaSão Paulo9.8
- 14ItabiraMinas Gerais9.6
- 15PiracicabaSão Paulo9.1
- 16AraucáriaParaná9.1
- 17Nova UniãoMinas Gerais8.8
- 18Ribeirão PretoSão Paulo8.8
- 19Conceição do Mato DentroMinas Gerais8.8
- 20TaubatéSão Paulo8.7
+ 12 more cities, the next at 8.4 µg/m³
Not counted on this day, too few days measured: Duque de Caxias since 20 Mar 2024, Santo André since 17 Mar 2024, Itaquaquecetuba since 9 Mar 2024 and 3 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.