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 16 Jan 2024: Santos 13.6 µg/m³, São Luís 13.4 µg/m³ and Serra 12.7 µg/m³.
- 1SantosSão Paulo13.6
- 2São LuísMaranhão13.4
- 3SerraEspírito Santo12.7
- 4Santo AndréSão Paulo12.0
- 5Ferraz de VasconcelosSão Paulo10.7
- 6São PauloSão Paulo10.6
- 7CampinasSão Paulo10.5
- 8Rio ClaroSão Paulo10.2
- 9ItaquaquecetubaSão Paulo10.0
- 10Duque de CaxiasRio de Janeiro10.0
- 11PaulíniaSão Paulo9.8
- 12GuaratinguetáSão Paulo9.7
- 13Rio de JaneiroRio de Janeiro9.6
- 14Coronel FabricianoMinas Gerais9.5
- 15JundiaíSão Paulo9.3
- 16CamaçariBahia9.2
- 17CongonhasMinas Gerais8.8
- 18PiracicabaSão Paulo8.5
- 19São José dos CamposSão Paulo8.4
- 20TaubatéSão Paulo8.2
+ 9 more cities, the next at 7.9 µg/m³
Not counted on this day, too few days measured: Açailândia since 15 Jan 2024, Limeira since 12 Jan 2024, Vitória since 7 Jan 2024 and 5 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.