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 31 May 2023: Rio Claro 21.0 µg/m³, Limeira 20.4 µg/m³ and Ferraz de Vasconcelos 18.1 µg/m³.
- 1Rio ClaroSão Paulo21.0
- 2LimeiraSão Paulo20.4
- 3Ferraz de VasconcelosSão Paulo18.1
- 4ItaquaquecetubaSão Paulo18.0
- 5AraucáriaParaná17.9
- 6TimóteoMinas Gerais17.7
- 7CampinasSão Paulo17.2
- 8São PauloSão Paulo17.1
- 9Coronel FabricianoMinas Gerais17.0
- 10Ribeirão PretoSão Paulo16.6
- 11Santo AndréSão Paulo16.4
- 12JundiaíSão Paulo15.6
- 13PiracicabaSão Paulo15.3
- 14CuritibaParaná15.1
- 15Nova UniãoMinas Gerais14.4
- 16TubarãoSanta Catarina13.4
- 17SantosSão Paulo13.3
- 18BetimMinas Gerais13.2
- 19IbiritéMinas Gerais13.0
- 20IpatingaMinas Gerais12.7
+ 13 more cities, the next at 12.6 µg/m³
Not counted on this day, too few days measured: São Félix do Xingu since 28 Apr 2023.
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.