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.

CountriesCities
The 30 days to15 Apr 2026 That day's board

The worst cities in Brazil for PM2.5 over the 30 days to 15 Apr 2026: Nilópolis 14.4 µg/m³, São Paulo 13.8 µg/m³ and Rio Claro 13.7 µg/m³.

  1. 1NilópolisRio de Janeiro14.4
  2. 2São PauloSão Paulo13.8
  3. 3Rio ClaroSão Paulo13.7
  4. 4LimeiraSão Paulo13.1
  5. 5JundiaíSão Paulo12.9
  6. 6Ferraz de VasconcelosSão Paulo12.8
  7. 7CampinasSão Paulo12.2
  8. 8SantosSão Paulo12.1
  9. 9PaulíniaSão Paulo11.4
  10. 10PiracicabaSão Paulo10.4
  11. 11ItaquaquecetubaSão Paulo10.4
  12. 12CubatãoSão Paulo10.2
  13. 13Presidente PrudenteSão Paulo9.9
  14. 14GuaratinguetáSão Paulo9.7
  15. 15BauruSão Paulo9.5
  16. 16TaubatéSão Paulo9.4
  17. 17São José dos CamposSão Paulo9.2
  18. 18Duque de CaxiasRio de Janeiro9.2
  19. 19São José do Rio PretoSão Paulo8.8
  20. 20Ribeirão PretoSão Paulo8.3

+ 3 more cities, the next at 6.8 µg/m³

30 days7 days
GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.