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 24 Nov 2023: Açailândia 27.1 µg/m³, Ipatinga 17.2 µg/m³ and Rio Claro 15.8 µg/m³.
- 1AçailândiaMaranhão27.1
- 2IpatingaMinas Gerais17.2
- 3Rio ClaroSão Paulo15.8
- 4Coronel FabricianoMinas Gerais15.6
- 5LimeiraSão Paulo14.9
- 6TimóteoMinas Gerais14.8
- 7CongonhasMinas Gerais14.5
- 8São LuísMaranhão14.4
- 9CampinasSão Paulo14.4
- 10Nova UniãoMinas Gerais14.3
- 11Ferraz de VasconcelosSão Paulo14.1
- 12São PauloSão Paulo13.9
- 13Ribeirão PretoSão Paulo13.9
- 14Conceição do Mato DentroMinas Gerais13.9
- 15PaulíniaSão Paulo13.6
- 16ItabiraMinas Gerais13.3
- 17SantosSão Paulo13.0
- 18Santo AndréSão Paulo12.9
- 19JundiaíSão Paulo12.6
- 20ItaquaquecetubaSão Paulo12.6
+ 10 more cities, the next at 12.2 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 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.