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 Jul 2026: Nilópolis 24.2 µg/m³, Rio Claro 17.1 µg/m³ and Duque de Caxias 16.6 µg/m³.
- 1NilópolisRio de Janeiro24.2
- 2Rio ClaroSão Paulo17.1
- 3Duque de CaxiasRio de Janeiro16.6
- 4Ferraz de VasconcelosSão Paulo15.8
- 5SorocabaSão Paulo15.0
- 6São PauloSão Paulo14.9
- 7Santo AndréSão Paulo14.1
- 8LimeiraSão Paulo14.1
- 9Ribeirão PretoSão Paulo13.6
- 10ItaguaíRio de Janeiro12.6
- 11PaulíniaSão Paulo12.1
- 12São José do Rio PretoSão Paulo12.0
- 13BauruSão Paulo12.0
- 14SantosSão Paulo11.7
- 15JundiaíSão Paulo11.7
- 16CampinasSão Paulo11.6
- 17Barra da TijucaRio de Janeiro11.3
- 18PiracicabaSão Paulo10.5
- 19São José dos CamposSão Paulo10.2
- 20CubatãoSão Paulo10.2
+ 6 more cities, the next at 10.0 µg/m³
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.