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 22 Sep 2024: Ribeirão Preto 69.4 µg/m³, São José do Rio Preto 45.0 µg/m³ and Rio Claro 40.4 µg/m³.
- 1Ribeirão PretoSão Paulo69.4
- 2São José do Rio PretoSão Paulo45.0
- 3Rio ClaroSão Paulo40.4
- 4CampinasSão Paulo35.7
- 5BetimMinas Gerais34.9
- 6JundiaíSão Paulo34.1
- 7São PauloSão Paulo33.6
- 8ItaquaquecetubaSão Paulo33.3
- 9Ferraz de VasconcelosSão Paulo33.0
- 10PaulíniaSão Paulo32.8
- 11Belo HorizonteMinas Gerais32.3
- 12Nova UniãoMinas Gerais32.2
- 13CongonhasMinas Gerais32.2
- 14LimeiraSão Paulo31.2
- 15Santo AndréSão Paulo31.0
- 16PiracicabaSão Paulo30.5
- 17IbiritéMinas Gerais27.6
- 18TaubatéSão Paulo27.4
- 19ItabiraMinas Gerais26.8
- 20GuaratinguetáSão Paulo26.0
+ 13 more cities, the next at 24.5 µg/m³
Not counted on this day, too few days measured: Tubarão since 2 Sep 2024, Presidente Prudente since 2 Sep 2024 and Timóteo since 22 Aug 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.