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 15 May 2024: Rio Claro 24.8 µg/m³, Campinas 21.3 µg/m³ and Itaquaquecetuba 20.9 µg/m³.
- 1Rio ClaroSão Paulo24.8
- 2CampinasSão Paulo21.3
- 3ItaquaquecetubaSão Paulo20.9
- 4Santo AndréSão Paulo19.7
- 5Ferraz de VasconcelosSão Paulo19.7
- 6JundiaíSão Paulo19.1
- 7São PauloSão Paulo18.2
- 8PaulíniaSão Paulo17.7
- 9LimeiraSão Paulo17.7
- 10São José do Rio PretoSão Paulo17.6
- 11Ribeirão PretoSão Paulo16.7
- 12PiracicabaSão Paulo15.5
- 13SantosSão Paulo15.4
- 14GuaratinguetáSão Paulo14.5
- 15São José dos CamposSão Paulo14.4
- 16TaubatéSão Paulo14.2
- 17São LuísMaranhão12.6
- 18SerraEspírito Santo11.6
- 19Vila VelhaEspírito Santo9.0
- 20São Félix do XinguPará1.8
Not counted on this day, too few days measured: Dias d'Ávila since 26 Apr 2024, Camaçari since 26 Apr 2024, Nova União since 25 Apr 2024 and 16 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.