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 5 Apr 2026: Nilópolis 14.8 µg/m³, São Paulo 13.5 µg/m³ and Rio Claro 13.3 µg/m³.
- 1NilópolisRio de Janeiro14.8
- 2São PauloSão Paulo13.5
- 3Rio ClaroSão Paulo13.3
- 4JundiaíSão Paulo12.7
- 5Ferraz de VasconcelosSão Paulo12.7
- 6CampinasSão Paulo12.0
- 7SantosSão Paulo11.2
- 8PaulíniaSão Paulo11.0
- 9ItaquaquecetubaSão Paulo10.3
- 10CubatãoSão Paulo9.9
- 11TaubatéSão Paulo9.2
- 12PiracicabaSão Paulo9.2
- 13BauruSão Paulo9.2
- 14GuaratinguetáSão Paulo9.1
- 15Duque de CaxiasRio de Janeiro9.1
- 16Presidente PrudenteSão Paulo8.8
- 17São José dos CamposSão Paulo8.7
- 18São José do Rio PretoSão Paulo7.9
- 19Ribeirão PretoSão Paulo7.6
- 20AcariRio de Janeiro6.9
+ 2 more cities, the next at 5.9 µg/m³
Not counted on this day, too few days measured: Limeira since 22 Mar 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.