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 17 Nov 2023: Açailândia 28.8 µg/m³, Rio Claro 16.8 µg/m³ and Limeira 15.8 µg/m³.
- 1AçailândiaMaranhão28.8
- 2Rio ClaroSão Paulo16.8
- 3LimeiraSão Paulo15.8
- 4IpatingaMinas Gerais15.6
- 5São LuísMaranhão14.9
- 6Ribeirão PretoSão Paulo14.9
- 7CampinasSão Paulo14.7
- 8São PauloSão Paulo14.3
- 9Coronel FabricianoMinas Gerais14.2
- 10Ferraz de VasconcelosSão Paulo13.9
- 11PaulíniaSão Paulo13.8
- 12Nova UniãoMinas Gerais13.7
- 13TimóteoMinas Gerais13.4
- 14Santo AndréSão Paulo13.3
- 15CongonhasMinas Gerais13.3
- 16JundiaíSão Paulo13.0
- 17ItaquaquecetubaSão Paulo12.8
- 18PiracicabaSão Paulo12.4
- 19Conceição do Mato DentroMinas Gerais12.3
- 20SantosSão Paulo12.1
+ 10 more cities, the next at 11.9 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 2 more cities.
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.