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 2 Sep 2026: Nilópolis 22.8 µg/m³, Rio Claro 21.1 µg/m³ and São José do Rio Preto 17.8 µg/m³.
- 1NilópolisRio de Janeiro22.8
- 2Rio ClaroSão Paulo21.1
- 3São José do Rio PretoSão Paulo17.8
- 4LimeiraSão Paulo17.5
- 5Ribeirão PretoSão Paulo17.1
- 6SorocabaSão Paulo17.0
- 7Ferraz de VasconcelosSão Paulo16.0
- 8São PauloSão Paulo15.7
- 9Santo AndréSão Paulo15.3
- 10JundiaíSão Paulo15.1
- 11PaulíniaSão Paulo14.4
- 12BauruSão Paulo14.4
- 13Duque de CaxiasRio de Janeiro14.0
- 14PiracicabaSão Paulo13.8
- 15CampinasSão Paulo13.3
- 16ItaquaquecetubaSão Paulo12.5
- 17TaubatéSão Paulo11.9
- 18São José dos CamposSão Paulo11.4
- 19CubatãoSão Paulo11.2
- 20Presidente PrudenteSão Paulo10.7
+ 4 more cities, the next at 10.5 µg/m³
Not counted on this day, too few days measured: Itaguaí since 15 Aug 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.