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 Feb 2026: Nilópolis 12.0 µg/m³, Santos 9.2 µg/m³ and Rio Claro 9.2 µg/m³.
- 1NilópolisRio de Janeiro12.0
- 2SantosSão Paulo9.2
- 3Rio ClaroSão Paulo9.2
- 4JundiaíSão Paulo9.1
- 5Presidente PrudenteSão Paulo8.8
- 6Ferraz de VasconcelosSão Paulo8.6
- 7CampinasSão Paulo8.2
- 8São PauloSão Paulo7.6
- 9LimeiraSão Paulo7.6
- 10BauruSão Paulo7.4
- 11Duque de CaxiasRio de Janeiro7.3
- 12PaulíniaSão Paulo6.8
- 13AcariRio de Janeiro6.7
- 14São José dos CamposSão Paulo6.5
- 15ItaquaquecetubaSão Paulo6.3
- 16CubatãoSão Paulo6.3
- 17GuaratinguetáSão Paulo6.1
- 18São José do Rio PretoSão Paulo5.9
- 19Rio de JaneiroRio de Janeiro5.7
- 20Barra da TijucaRio de Janeiro5.4
+ 1 more city, at 5.2 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 27 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.