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 13 Aug 2026: Nilópolis 27.3 µg/m³, Ferraz de Vasconcelos 17.7 µg/m³ and Santo André 17.3 µg/m³.
- 1NilópolisRio de Janeiro27.3
- 2Ferraz de VasconcelosSão Paulo17.7
- 3Santo AndréSão Paulo17.3
- 4Rio ClaroSão Paulo17.2
- 5LimeiraSão Paulo16.9
- 6Duque de CaxiasRio de Janeiro16.8
- 7SorocabaSão Paulo15.8
- 8São PauloSão Paulo15.6
- 9Ribeirão PretoSão Paulo15.4
- 10São José do Rio PretoSão Paulo14.2
- 11BauruSão Paulo13.9
- 12PaulíniaSão Paulo13.5
- 13JundiaíSão Paulo13.0
- 14São José dos CamposSão Paulo12.5
- 15TaubatéSão Paulo12.4
- 16ItaguaíRio de Janeiro12.1
- 17CubatãoSão Paulo11.7
- 18Barra da TijucaRio de Janeiro11.6
- 19CampinasSão Paulo11.4
- 20PiracicabaSão Paulo11.2
+ 4 more cities, the next at 10.1 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.