Chimney smoking
| 1975 (metric tonnes) | 1995 (metric tonnes) | NUMBER OF FIELDS INCREASE | |
| Toxocity* | 379,136.4 | 1,258,545.5 | 3.31 |
| Heavy metals | 9,181.8 | 38,772.7 | 4.22 |
| BOD | 286.4 | 818.2 | 2.9 |
| SOx | 141,636.4 | 524,727.3 | 3.7 |
| Particulates | 44,590.9 | 171,954.5 | 3.85 |
| Suspended solids | 250 | 818.2 | 3.28 |
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