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 6 Mar 2026: Presidente Prudente 11.8 µg/m³, Nilópolis 11.0 µg/m³ and Rio Claro 10.1 µg/m³.
- 1Presidente PrudenteSão Paulo11.8
- 2NilópolisRio de Janeiro11.0
- 3Rio ClaroSão Paulo10.1
- 4JundiaíSão Paulo10.1
- 5CampinasSão Paulo9.9
- 6LimeiraSão Paulo9.8
- 7SantosSão Paulo9.5
- 8Ferraz de VasconcelosSão Paulo9.2
- 9BauruSão Paulo8.9
- 10São PauloSão Paulo8.8
- 11PiracicabaSão Paulo8.6
- 12PaulíniaSão Paulo8.4
- 13ItaquaquecetubaSão Paulo8.3
- 14São José do Rio PretoSão Paulo7.9
- 15Ribeirão PretoSão Paulo7.6
- 16Duque de CaxiasRio de Janeiro7.1
- 17São José dos CamposSão Paulo6.9
- 18GuaratinguetáSão Paulo6.8
- 19AcariRio de Janeiro6.2
- 20CubatãoSão Paulo5.6
+ 2 more cities, the next at 5.5 µg/m³
Not counted on this day, too few days measured: Taubaté since 6 Feb 2026, Guarapuava since 10 Jan 2026, Guarapari since 10 Jan 2026 and 10 more cities.
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.