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 24 Jul 2024: Rio Claro 25.8 µg/m³, São José do Rio Preto 24.5 µg/m³ and Ribeirão Preto 24.1 µg/m³.
- 1Rio ClaroSão Paulo25.8
- 2São José do Rio PretoSão Paulo24.5
- 3Ribeirão PretoSão Paulo24.1
- 4CampinasSão Paulo22.8
- 5Ferraz de VasconcelosSão Paulo22.2
- 6ItaquaquecetubaSão Paulo21.5
- 7LimeiraSão Paulo21.4
- 8São PauloSão Paulo21.0
- 9PaulíniaSão Paulo21.0
- 10JundiaíSão Paulo20.5
- 11CongonhasMinas Gerais20.1
- 12BetimMinas Gerais19.6
- 13PiracicabaSão Paulo18.9
- 14ItabiraMinas Gerais18.3
- 15Coronel FabricianoMinas Gerais17.2
- 16GuaratinguetáSão Paulo17.0
- 17Nova UniãoMinas Gerais16.4
- 18Rio de JaneiroRio de Janeiro16.2
- 19TaubatéSão Paulo16.0
- 20TimóteoMinas Gerais15.7
+ 13 more cities, the next at 15.6 µg/m³
Not counted on this day, too few days measured: Serra since 10 Jul 2024, São Luís since 9 Jul 2024, Ibirité since 26 Jun 2024 and 2 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, 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.