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 20 Jul 2023: Açailândia 26.9 µg/m³, Itaquaquecetuba 23.0 µg/m³ and Santo André 22.8 µg/m³.
- 1AçailândiaMaranhão26.9
- 2ItaquaquecetubaSão Paulo23.0
- 3Santo AndréSão Paulo22.8
- 4Rio ClaroSão Paulo22.5
- 5São PauloSão Paulo21.5
- 6Ferraz de VasconcelosSão Paulo20.8
- 7CampinasSão Paulo20.0
- 8TimóteoMinas Gerais19.6
- 9LimeiraSão Paulo18.2
- 10Coronel FabricianoMinas Gerais17.9
- 11BetimMinas Gerais17.5
- 12Ribeirão PretoSão Paulo17.3
- 13JundiaíSão Paulo17.3
- 14SantosSão Paulo17.1
- 15PaulíniaSão Paulo16.6
- 16Nova UniãoMinas Gerais16.5
- 17Belo HorizonteMinas Gerais15.7
- 18CuritibaParaná15.5
- 19GuaratinguetáSão Paulo15.3
- 20TaubatéSão Paulo15.2
+ 15 more cities, the next at 15.1 µg/m³
Days missing from the source archive fall in this window, so fewer countries are counted.
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.