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 23 Aug 2024: Rio Claro 33.7 µg/m³, Ferraz de Vasconcelos 32.3 µg/m³ and São José do Rio Preto 31.7 µg/m³.
- 1Rio ClaroSão Paulo33.7
- 2Ferraz de VasconcelosSão Paulo32.3
- 3São José do Rio PretoSão Paulo31.7
- 4ItaquaquecetubaSão Paulo31.6
- 5São PauloSão Paulo28.7
- 6Ribeirão PretoSão Paulo27.8
- 7CuritibaParaná27.8
- 8CampinasSão Paulo27.6
- 9AraucáriaParaná27.5
- 10LimeiraSão Paulo26.9
- 11PaulíniaSão Paulo24.6
- 12PiracicabaSão Paulo23.1
- 13Rio de JaneiroRio de Janeiro21.5
- 14SantosSão Paulo21.1
- 15CongonhasMinas Gerais21.0
- 16São José dos CamposSão Paulo20.8
- 17TubarãoSanta Catarina20.6
- 18BetimMinas Gerais20.4
- 19TaubatéSão Paulo20.1
- 20GuaratinguetáSão Paulo19.2
+ 13 more cities, the next at 18.1 µg/m³
Not counted on this day, too few days measured: Timóteo since 22 Aug 2024, Jundiaí since 9 Aug 2024, São Luís since 9 Jul 2024 and Santo André since 25 Jun 2024.
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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.