| For the first few years arsenic trioxide went up the smokestack as vapour and came down in the surrounding area as dust. |
| A smokestack extension collapsed and fell onto oxygen and nitrogen pipelines. |
| A shopkeeper in Anmin said the smoke soared to the height of a factory smokestack but receded after about 10 minutes. |
| One way to remove unwanted gases is to pass them through a solution of calcium oxide in the smokestack. |
| How clean would you make your factory if its water intake were downstream of its outfall, or if its air intake were connected to its smokestack? |
| Any doubt that this was the engine room was displaced by the black metal smokestack that rose up through the cabin roof. |
