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 25 Oct 2023: Açailândia 28.9 µg/m³, São Luís 16.7 µg/m³ and Rio Claro 15.4 µg/m³.
- 1AçailândiaMaranhão28.9
- 2São LuísMaranhão16.7
- 3Rio ClaroSão Paulo15.4
- 4Ribeirão PretoSão Paulo15.3
- 5CampinasSão Paulo14.4
- 6Nova UniãoMinas Gerais14.2
- 7LimeiraSão Paulo14.2
- 8São PauloSão Paulo13.7
- 9PaulíniaSão Paulo13.7
- 10Coronel FabricianoMinas Gerais12.5
- 11JundiaíSão Paulo12.4
- 12Santo AndréSão Paulo12.3
- 13PiracicabaSão Paulo12.2
- 14CongonhasMinas Gerais12.1
- 15IpatingaMinas Gerais11.9
- 16Ferraz de VasconcelosSão Paulo11.9
- 17TimóteoMinas Gerais11.8
- 18ItaquaquecetubaSão Paulo10.7
- 19ItabiraMinas Gerais10.1
- 20São José dos CamposSão Paulo8.8
+ 6 more cities, the next at 8.4 µg/m³
Not counted on this day, too few days measured: Canaã dos Carajás since 23 Oct 2023, Taubaté since 20 Oct 2023, Duque de Caxias since 19 Oct 2023 and 6 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.