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 25 Feb 2024: Santo André 12.6 µg/m³, Timóteo 11.8 µg/m³ and São Paulo 11.8 µg/m³.
- 1Santo AndréSão Paulo12.6
- 2TimóteoMinas Gerais11.8
- 3São PauloSão Paulo11.8
- 4SantosSão Paulo11.4
- 5CampinasSão Paulo10.9
- 6Ferraz de VasconcelosSão Paulo10.8
- 7Coronel FabricianoMinas Gerais10.7
- 8AraucáriaParaná10.7
- 9Rio ClaroSão Paulo10.4
- 10GuaratinguetáSão Paulo10.2
- 11JundiaíSão Paulo10.1
- 12ItaquaquecetubaSão Paulo10.1
- 13SerraEspírito Santo10.0
- 14CongonhasMinas Gerais9.2
- 15PaulíniaSão Paulo8.9
- 16PiracicabaSão Paulo8.4
- 17CamaçariBahia8.2
- 18VitóriaEspírito Santo8.1
- 19Rio de JaneiroRio de Janeiro8.1
- 20São José dos CamposSão Paulo8.0
+ 14 more cities, the next at 7.7 µg/m³
Not counted on this day, too few days measured: São Luís since 25 Feb 2024, 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, 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.