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 3 Aug 2026: Nilópolis 23.6 µg/m³, Ferraz de Vasconcelos 18.4 µg/m³ and Limeira 17.9 µg/m³.
- 1NilópolisRio de Janeiro23.6
- 2Ferraz de VasconcelosSão Paulo18.4
- 3LimeiraSão Paulo17.9
- 4Santo AndréSão Paulo17.6
- 5Rio ClaroSão Paulo17.4
- 6SorocabaSão Paulo16.8
- 7São PauloSão Paulo16.3
- 8Ribeirão PretoSão Paulo15.2
- 9Duque de CaxiasRio de Janeiro14.4
- 10São José do Rio PretoSão Paulo13.7
- 11BauruSão Paulo13.7
- 12PaulíniaSão Paulo13.6
- 13JundiaíSão Paulo12.9
- 14ItaguaíRio de Janeiro12.6
- 15São José dos CamposSão Paulo12.0
- 16CampinasSão Paulo12.0
- 17TaubatéSão Paulo11.9
- 18PiracicabaSão Paulo11.7
- 19CubatãoSão Paulo10.5
- 20Barra da TijucaRio de Janeiro9.9
+ 4 more cities, the next at 9.8 µg/m³
Not counted on this day, too few days measured: Guaratinguetá since 30 Jul 2026 and Santos since 29 Jul 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.