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 15 Feb 2024: São Luís 20.5 µg/m³, Timóteo 12.0 µg/m³ and Santos 11.3 µg/m³.
- 1São LuísMaranhão20.5
- 2TimóteoMinas Gerais12.0
- 3SantosSão Paulo11.3
- 4Coronel FabricianoMinas Gerais11.1
- 5Santo AndréSão Paulo10.7
- 6São PauloSão Paulo10.5
- 7AraucáriaParaná10.5
- 8CampinasSão Paulo10.0
- 9GuaratinguetáSão Paulo9.8
- 10Ferraz de VasconcelosSão Paulo9.8
- 11Rio ClaroSão Paulo9.7
- 12CongonhasMinas Gerais9.4
- 13JundiaíSão Paulo9.3
- 14ItaquaquecetubaSão Paulo9.3
- 15SerraEspírito Santo8.6
- 16CamaçariBahia8.6
- 17PaulíniaSão Paulo8.3
- 18Rio de JaneiroRio de Janeiro8.1
- 19CuritibaParaná8.1
- 20VitóriaEspírito Santo7.9
+ 15 more cities, the next at 7.9 µg/m³
Not counted on this day, too few days measured: Parauapebas since 17 Jan 2024, Açailândia since 15 Jan 2024 and Limeira since 12 Jan 2024. 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.