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 30 Jun 2023: Santo André 22.4 µg/m³, Ferraz de Vasconcelos 22.0 µg/m³ and Itaquaquecetuba 21.6 µg/m³.
- 1Santo AndréSão Paulo22.4
- 2Ferraz de VasconcelosSão Paulo22.0
- 3ItaquaquecetubaSão Paulo21.6
- 4São PauloSão Paulo20.3
- 5Rio ClaroSão Paulo20.2
- 6AçailândiaMaranhão18.5
- 7CampinasSão Paulo17.6
- 8TimóteoMinas Gerais17.5
- 9SantosSão Paulo17.1
- 10Coronel FabricianoMinas Gerais16.8
- 11CuritibaParaná16.5
- 12Ribeirão PretoSão Paulo16.2
- 13Nova UniãoMinas Gerais15.3
- 14AraucáriaParaná14.8
- 15São José dos CamposSão Paulo14.5
- 16CongonhasMinas Gerais14.5
- 17PaulíniaSão Paulo14.4
- 18GuaratinguetáSão Paulo14.1
- 19BetimMinas Gerais14.1
- 20TaubatéSão Paulo13.6
+ 11 more cities, the next at 13.3 µg/m³
Not counted on this day, too few days measured: Tubarão since 15 Jun 2023, Ibirité since 14 Jun 2023, Limeira since 10 Jun 2023 and Jundiaí since 9 Jun 2023.
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.