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 4 Feb 2026: Nilópolis 12.9 µg/m³, Jundiaí 10.4 µg/m³ and Santos 9.7 µg/m³.
- 1NilópolisRio de Janeiro12.9
- 2JundiaíSão Paulo10.4
- 3SantosSão Paulo9.7
- 4Ferraz de VasconcelosSão Paulo9.7
- 5Rio ClaroSão Paulo9.0
- 6São PauloSão Paulo8.4
- 7Presidente PrudenteSão Paulo8.4
- 8CampinasSão Paulo8.4
- 9TaubatéSão Paulo8.0
- 10Duque de CaxiasRio de Janeiro8.0
- 11LimeiraSão Paulo7.7
- 12PaulíniaSão Paulo7.6
- 13ItaquaquecetubaSão Paulo7.4
- 14AcariRio de Janeiro7.3
- 15São José dos CamposSão Paulo7.1
- 16CubatãoSão Paulo7.1
- 17Rio de JaneiroRio de Janeiro6.3
- 18São José do Rio PretoSão Paulo5.9
- 19Barra da TijucaRio de Janeiro5.8
- 20Ribeirão PretoSão Paulo5.4
Not counted on this day, too few days measured: Guarapuava since 10 Jan 2026, Guarapari since 10 Jan 2026, Francisco Beltrão since 10 Jan 2026 and 26 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.