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 27 Nov 2023: Açailândia 26.8 µg/m³, Ipatinga 16.5 µg/m³ and Coronel Fabriciano 15.6 µg/m³.
- 1AçailândiaMaranhão26.8
- 2IpatingaMinas Gerais16.5
- 3Coronel FabricianoMinas Gerais15.6
- 4Rio ClaroSão Paulo15.2
- 5TimóteoMinas Gerais14.7
- 6São LuísMaranhão14.6
- 7Nova UniãoMinas Gerais14.5
- 8LimeiraSão Paulo14.3
- 9CongonhasMinas Gerais14.3
- 10Ferraz de VasconcelosSão Paulo14.2
- 11São PauloSão Paulo13.9
- 12CampinasSão Paulo13.9
- 13Conceição do Mato DentroMinas Gerais13.8
- 14Santo AndréSão Paulo13.5
- 15ItabiraMinas Gerais13.5
- 16Ribeirão PretoSão Paulo13.3
- 17SantosSão Paulo13.2
- 18PaulíniaSão Paulo13.0
- 19ItaquaquecetubaSão Paulo12.6
- 20JundiaíSão Paulo12.5
+ 10 more cities, the next at 12.0 µg/m³
Not counted on this day, too few days measured: Parauapebas since 17 Nov 2023, Ibirité since 1 Nov 2023, Canaã dos Carajás since 23 Oct 2023 and Taubaté since 20 Oct 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.