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 Jan 2024: São Luís 12.6 µg/m³, Santos 12.3 µg/m³ and Santo André 10.1 µg/m³.
- 1São LuísMaranhão12.6
- 2SantosSão Paulo12.3
- 3Santo AndréSão Paulo10.1
- 4Coronel FabricianoMinas Gerais10.1
- 5Ferraz de VasconcelosSão Paulo9.3
- 6CampinasSão Paulo9.3
- 7São PauloSão Paulo9.2
- 8GuaratinguetáSão Paulo9.1
- 9Rio ClaroSão Paulo9.0
- 10PaulíniaSão Paulo8.9
- 11ItaquaquecetubaSão Paulo8.9
- 12CongonhasMinas Gerais8.8
- 13Duque de CaxiasRio de Janeiro8.5
- 14JundiaíSão Paulo8.4
- 15CamaçariBahia8.1
- 16Rio de JaneiroRio de Janeiro8.0
- 17Conceição do Mato DentroMinas Gerais7.9
- 18São José dos CamposSão Paulo7.8
- 19TimóteoMinas Gerais7.6
- 20Ribeirão PretoSão Paulo7.6
+ 10 more cities, the next at 7.5 µg/m³
Not counted on this day, too few days measured: Serra since 17 Jan 2024, Parauapebas since 17 Jan 2024, Açailândia since 15 Jan 2024 and 5 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.