Table 1.
Annual average SO2 concentrations during 2000–2005 reported from selected cities worldwide (modified).20
| REGION | CITY (SELECTED) | ANNUAL AVERAGE SO2 CONCENTRATIONS IN 2000–2005 (approximations; ppb) |
|---|---|---|
| Asia | Beijing | 24.8 |
| Hong Kong | 6.9 | |
| Tokyo | 3.8 | |
| Mumbai | 13.4 | |
| All cities (range) | 2.3–24.8 | |
| Africa | Harare | 38.2 |
| Cairo | 15.3 | |
| Johannesburg | 6.9 | |
| Cape Town | 3.8 | |
| All cities (range) | 3.8–38.2 | |
| Latin America | Mexico City | 26.7 |
| Bogota | 22.9 | |
| Sao Paulo | 15.3 | |
| All cities (range) | 15.3–26.7 | |
| North America | Pittsburgh | 13.4 |
| New York | 11.5 | |
| Los Angeles | 4.6 | |
| Seattle | 3.4 | |
| Vancouver | 6.5 | |
| All cities (range) | 3.4–13.4 | |
| Europe | Athens | 11.5 |
| Berlin | 4.6 | |
| Oslo | 3.8 | |
| Barcelona | 3.8 | |
| All cities (range) | 3.1–13.7 |