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 5 May 2026: Rio Claro 18.9 µg/m³, Nilópolis 15.0 µg/m³ and Limeira 14.4 µg/m³.
- 1Rio ClaroSão Paulo18.9
- 2NilópolisRio de Janeiro15.0
- 3LimeiraSão Paulo14.4
- 4JundiaíSão Paulo14.4
- 5CampinasSão Paulo13.7
- 6São José do Rio PretoSão Paulo13.5
- 7Ferraz de VasconcelosSão Paulo13.5
- 8São PauloSão Paulo13.3
- 9PaulíniaSão Paulo12.6
- 10Ribeirão PretoSão Paulo12.4
- 11PiracicabaSão Paulo11.9
- 12Presidente PrudenteSão Paulo11.7
- 13ItaguaíRio de Janeiro11.3
- 14TaubatéSão Paulo11.1
- 15BauruSão Paulo11.0
- 16GuaratinguetáSão Paulo10.9
- 17SantosSão Paulo10.7
- 18Duque de CaxiasRio de Janeiro10.7
- 19São José dos CamposSão Paulo10.1
- 20CubatãoSão Paulo10.0
+ 4 more cities, the next at 9.4 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.