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 18 Sep 2023: Açailândia 32.1 µg/m³, Rio Claro 18.9 µg/m³ and Ferraz de Vasconcelos 18.7 µg/m³.
- 1AçailândiaMaranhão32.1
- 2Rio ClaroSão Paulo18.9
- 3Ferraz de VasconcelosSão Paulo18.7
- 4Santo AndréSão Paulo16.3
- 5Ribeirão PretoSão Paulo16.2
- 6São PauloSão Paulo16.0
- 7ItaquaquecetubaSão Paulo16.0
- 8CampinasSão Paulo15.2
- 9Nova UniãoMinas Gerais14.9
- 10LimeiraSão Paulo14.8
- 11JundiaíSão Paulo14.3
- 12PaulíniaSão Paulo14.2
- 13São LuísMaranhão14.1
- 14PiracicabaSão Paulo13.6
- 15TimóteoMinas Gerais13.5
- 16GuaratinguetáSão Paulo13.5
- 17CongonhasMinas Gerais13.0
- 18SantosSão Paulo12.7
- 19Coronel FabricianoMinas Gerais12.6
- 20BetimMinas Gerais11.9
+ 9 more cities, the next at 11.5 µg/m³
Not counted on this day, too few days measured: Belo Horizonte since 18 Sep 2023, Paracatu since 17 Sep 2023, Tubarão since 15 Sep 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.