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 21 May 2023: Rio Claro 18.8 µg/m³, Limeira 18.0 µg/m³ and Timóteo 16.9 µg/m³.
- 1Rio ClaroSão Paulo18.8
- 2LimeiraSão Paulo18.0
- 3TimóteoMinas Gerais16.9
- 4CampinasSão Paulo16.8
- 5AraucáriaParaná16.4
- 6ItaquaquecetubaSão Paulo16.2
- 7Ribeirão PretoSão Paulo16.0
- 8Ferraz de VasconcelosSão Paulo16.0
- 9São PauloSão Paulo15.9
- 10Coronel FabricianoMinas Gerais15.9
- 11Santo AndréSão Paulo15.5
- 12JundiaíSão Paulo14.4
- 13Nova UniãoMinas Gerais14.0
- 14PiracicabaSão Paulo13.9
- 15IbiritéMinas Gerais13.0
- 16CongonhasMinas Gerais12.7
- 17TubarãoSanta Catarina12.5
- 18Belo HorizonteMinas Gerais12.3
- 19GuaratinguetáSão Paulo12.2
- 20SantosSão Paulo12.1
+ 12 more cities, the next at 11.9 µg/m³
Not counted on this day, too few days measured: São Félix do Xingu since 28 Apr 2023 and Dias d'Ávila since 7 Apr 2023. Days missing from the source archive fall in this window, so fewer countries are counted.
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.