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 4 Jun 2026: Nilópolis 16.9 µg/m³, Ribeirão Preto 13.7 µg/m³ and Ferraz de Vasconcelos 13.5 µg/m³.
- 1NilópolisRio de Janeiro16.9
- 2Ribeirão PretoSão Paulo13.7
- 3Ferraz de VasconcelosSão Paulo13.5
- 4São PauloSão Paulo13.2
- 5LimeiraSão Paulo12.9
- 6São José do Rio PretoSão Paulo12.7
- 7PaulíniaSão Paulo12.3
- 8Santo AndréSão Paulo11.8
- 9ItaguaíRio de Janeiro11.8
- 10Duque de CaxiasRio de Janeiro11.2
- 11TaubatéSão Paulo10.9
- 12CubatãoSão Paulo10.7
- 13SantosSão Paulo10.4
- 14PiracicabaSão Paulo10.4
- 15GuaratinguetáSão Paulo10.0
- 16BauruSão Paulo9.4
- 17São José dos CamposSão Paulo9.3
- 18ItaquaquecetubaSão Paulo8.0
- 19Barra da TijucaRio de Janeiro7.3
- 20AcariRio de Janeiro7.0
+ 1 more city, at 6.4 µg/m³
Not counted on this day, too few days measured: Campinas since 19 May 2026, Jundiaí since 18 May 2026, Presidente Prudente since 11 May 2026 and Rio Claro since 10 May 2026.
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.