Table 4.
Concentration of PM2.5 in the ambient air of urban areas around the world
| City/region | PM2.5 concentrations (μg m−3) | |
|---|---|---|
| Summer | Winter | |
| São Paulo, Brazil (this study) | 23.1 | 35.5 |
| Rio de Janeiro, Brazil (this study) | 15.8 | 23.0 |
| Belo Horizonte, Brazil (this study) | 14.5 | 18.5 |
| Porto Alegre, Brazil (this study) | 13.9 | 19.3 |
| Curitiba, Brazil (this study) | 13.3 | 18.1 |
| Recife, Brazil (this study) | 10.5 | 12.5 |
| Beijing, China (Zhao et al. 2009) | 85.8 | 91.1 |
| Yokohama, Japan (Khan et al. 2010) | 20.8 | 21.1 |
| Agra, India (Kulshrestha et al. 2009) | 64.2 | 144.2 |
| Zonguldak, Turkey (Akyuz and Çabuk 2009) | 32.4 | 83.3 |
| United Statesa (Bell et al. 2007) | 16.2 | 13.9 |
| Helsinki, Finland (Sillanpaa et al. 2000) | 12.1 | 10.2 |
aMulti-city study