| For the first few years arsenic trioxide went up the smokestack as vapour and came down in the surrounding area as dust. |
| 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? |
| One way to remove unwanted gases is to pass them through a solution of calcium oxide in the smokestack. |
| If the air is dirty, there must be a missing scrubber on a smokestack or a drainpipe that needs a filter. |
| Let us not allow the tearing down of that smokestack in Halifax be a symbol for the future of the industry itself. |
| A smokestack extension collapsed and fell onto oxygen and nitrogen pipelines. |
