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 12 Oct 2026: Rio Claro 15.1 µg/m³, Nilópolis 14.6 µg/m³ and São José do Rio Preto 11.8 µg/m³.
- 1Rio ClaroSão Paulo15.1
- 2NilópolisRio de Janeiro14.6
- 3São José do Rio PretoSão Paulo11.8
- 4São PauloSão Paulo11.3
- 5ItaquaquecetubaSão Paulo11.2
- 6Ribeirão PretoSão Paulo10.4
- 7Ferraz de VasconcelosSão Paulo10.4
- 8JundiaíSão Paulo10.2
- 9Santo AndréSão Paulo10.1
- 10BauruSão Paulo9.5
- 11PaulíniaSão Paulo9.4
- 12CampinasSão Paulo9.2
- 13PiracicabaSão Paulo8.9
- 14ItaguaíRio de Janeiro8.8
- 15SorocabaSão Paulo8.7
- 16Duque de CaxiasRio de Janeiro8.7
- 17GuaratinguetáSão Paulo8.4
- 18São José dos CamposSão Paulo7.6
- 19TaubatéSão Paulo7.2
- 20Barra da TijucaRio de Janeiro7.1
+ 4 more cities, the next at 6.8 µg/m³
Not counted on this day, too few days measured: Cubatão since 12 Oct 2026 and Limeira since 6 Oct 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.