Estimated relative risk (95% CI) of SO2 (50 ppb) and TSP (100 μg/m3) in baseline meta-analysis and after control for the other pollutant
| Baseline model | Controlling for TSP | |
| SO2 | 1.12 (1.08 to 1.16) | 1.02 (0.89 to 1.16) |
| TSP | 1.09 (1.06 to 1.13) | 1.21 (1.10 to 1.32) |
| Controlling for visibility | 1.01 (0.95 to 1.08) |