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 25 May 2024: Campinas 22.3 µg/m³, Itaquaquecetuba 21.9 µg/m³ and Santo André 21.8 µg/m³.
- 1CampinasSão Paulo22.3
- 2ItaquaquecetubaSão Paulo21.9
- 3Santo AndréSão Paulo21.8
- 4Ferraz de VasconcelosSão Paulo21.2
- 5JundiaíSão Paulo20.5
- 6LimeiraSão Paulo19.8
- 7Ribeirão PretoSão Paulo19.4
- 8PaulíniaSão Paulo19.3
- 9São PauloSão Paulo18.9
- 10São José do Rio PretoSão Paulo18.8
- 11PiracicabaSão Paulo17.2
- 12TaubatéSão Paulo16.3
- 13São José dos CamposSão Paulo15.4
- 14SantosSão Paulo14.2
- 15CongonhasMinas Gerais14.2
- 16ParacatuMinas Gerais13.4
- 17TimóteoMinas Gerais13.1
- 18ItabiraMinas Gerais12.9
- 19São LuísMaranhão12.5
- 20Nova UniãoMinas Gerais12.4
+ 7 more cities, the next at 12.4 µg/m³
Not counted on this day, too few days measured: Rio Claro since 24 May 2024, Guaratinguetá since 16 May 2024, Dias d'Ávila since 26 Apr 2024 and 9 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.