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 28 May 2023: Rio Claro 21.6 µg/m³, Limeira 20.8 µg/m³ and Itaquaquecetuba 18.4 µg/m³.
- 1Rio ClaroSão Paulo21.6
- 2LimeiraSão Paulo20.8
- 3ItaquaquecetubaSão Paulo18.4
- 4Ferraz de VasconcelosSão Paulo18.3
- 5AraucáriaParaná18.1
- 6CampinasSão Paulo17.9
- 7São PauloSão Paulo17.7
- 8TimóteoMinas Gerais17.4
- 9Ribeirão PretoSão Paulo17.3
- 10Santo AndréSão Paulo17.2
- 11Coronel FabricianoMinas Gerais16.8
- 12JundiaíSão Paulo16.3
- 13PiracicabaSão Paulo15.3
- 14CuritibaParaná15.1
- 15Nova UniãoMinas Gerais13.9
- 16SantosSão Paulo13.8
- 17TubarãoSanta Catarina13.5
- 18IbiritéMinas Gerais12.9
- 19BetimMinas Gerais12.6
- 20GuaratinguetáSão Paulo12.5
+ 13 more cities, the next at 12.5 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 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.