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 19 Aug 2023: Açailândia 28.6 µg/m³, Rio Claro 24.0 µg/m³ and Ferraz de Vasconcelos 21.4 µg/m³.
- 1AçailândiaMaranhão28.6
- 2Rio ClaroSão Paulo24.0
- 3Ferraz de VasconcelosSão Paulo21.4
- 4São PauloSão Paulo20.9
- 5ItaquaquecetubaSão Paulo20.9
- 6Santo AndréSão Paulo20.7
- 7CampinasSão Paulo20.5
- 8São LuísMaranhão19.1
- 9LimeiraSão Paulo19.1
- 10PaulíniaSão Paulo18.2
- 11Ribeirão PretoSão Paulo18.1
- 12JundiaíSão Paulo18.0
- 13TimóteoMinas Gerais17.3
- 14PiracicabaSão Paulo16.8
- 15SantosSão Paulo15.9
- 16GuaratinguetáSão Paulo14.8
- 17Coronel FabricianoMinas Gerais14.8
- 18TubarãoSanta Catarina14.1
- 19Nova UniãoMinas Gerais13.7
- 20CongonhasMinas Gerais13.7
+ 12 more cities, the next at 13.6 µg/m³
Not counted on this day, too few days measured: Brumadinho since 18 Aug 2023, Curitiba since 15 Aug 2023 and Araucária since 15 Aug 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.