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 14 Jun 2026: Nilópolis 24.3 µg/m³, Rio Claro 16.0 µg/m³ and Duque de Caxias 15.5 µg/m³.
- 1NilópolisRio de Janeiro24.3
- 2Rio ClaroSão Paulo16.0
- 3Duque de CaxiasRio de Janeiro15.5
- 4ItaguaíRio de Janeiro14.2
- 5Ferraz de VasconcelosSão Paulo14.1
- 6Ribeirão PretoSão Paulo13.9
- 7São PauloSão Paulo13.5
- 8São José do Rio PretoSão Paulo13.2
- 9LimeiraSão Paulo12.8
- 10Santo AndréSão Paulo12.0
- 11PaulíniaSão Paulo11.6
- 12Barra da TijucaRio de Janeiro10.8
- 13SantosSão Paulo10.5
- 14TaubatéSão Paulo10.2
- 15CubatãoSão Paulo10.1
- 16PiracicabaSão Paulo10.0
- 17São José dos CamposSão Paulo9.9
- 18GuaratinguetáSão Paulo9.3
- 19BauruSão Paulo9.3
- 20AcariRio de Janeiro9.0
+ 2 more cities, the next at 8.1 µg/m³
Not counted on this day, too few days measured: Campinas since 19 May 2026, Jundiaí since 18 May 2026 and Presidente Prudente since 11 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.