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 Apr 2024: Campinas 17.0 µg/m³, Rio Claro 16.8 µg/m³ and Limeira 15.7 µg/m³.
- 1CampinasSão Paulo17.0
- 2Rio ClaroSão Paulo16.8
- 3LimeiraSão Paulo15.7
- 4Santo AndréSão Paulo14.9
- 5ItaquaquecetubaSão Paulo14.8
- 6São PauloSão Paulo14.5
- 7Ferraz de VasconcelosSão Paulo14.2
- 8PaulíniaSão Paulo13.9
- 9São LuísMaranhão13.6
- 10JundiaíSão Paulo13.5
- 11PiracicabaSão Paulo12.6
- 12GuaratinguetáSão Paulo12.1
- 13SantosSão Paulo11.9
- 14São José dos CamposSão Paulo11.5
- 15São José do Rio PretoSão Paulo11.2
- 16TaubatéSão Paulo10.5
- 17Vila VelhaEspírito Santo7.9
- 18SerraEspírito Santo7.9
- 19CamaçariBahia6.0
- 20Dias d'ÁvilaBahia5.4
+ 1 more city, at 1.8 µg/m³
Not counted on this day, too few days measured: Nova União since 25 Apr 2024, Timóteo since 25 Apr 2024, Ipatinga since 25 Apr 2024 and 16 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, 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.