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 27 Dec 2023: Açailândia 19.1 µg/m³, Santos 14.6 µg/m³ and São Luís 13.7 µg/m³.
- 1AçailândiaMaranhão19.1
- 2SantosSão Paulo14.6
- 3São LuísMaranhão13.7
- 4Santo AndréSão Paulo13.7
- 5São PauloSão Paulo13.2
- 6Ferraz de VasconcelosSão Paulo12.5
- 7CampinasSão Paulo12.4
- 8Rio ClaroSão Paulo12.3
- 9LimeiraSão Paulo12.2
- 10SerraEspírito Santo11.9
- 11ItaquaquecetubaSão Paulo11.6
- 12AraucáriaParaná11.6
- 13JundiaíSão Paulo11.0
- 14TimóteoMinas Gerais10.9
- 15Rio de JaneiroRio de Janeiro10.9
- 16GuaratinguetáSão Paulo10.8
- 17Duque de CaxiasRio de Janeiro10.7
- 18PaulíniaSão Paulo10.6
- 19CongonhasMinas Gerais10.6
- 20IpatingaMinas Gerais10.2
+ 14 more cities, the next at 10.1 µg/m³
Not counted on this day, too few days measured: Conceição do Mato Dentro since 19 Dec 2023, Betim since 16 Dec 2023, Belo Horizonte since 1 Dec 2023 and Ibirité since 1 Nov 2023.
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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.