Those represent the major forms of smokestack pollution emitted by power plants.
From the post-gazette.com
Three buildings, the smokestack and two parking lots sit on the eight-acre site.
From the stltoday.com
The teapot can be put on the top of the samovar's smokestack to keep the tea hot.
From the kansas.com
A functioning smokestack can be seen in the background to the right of Basilea.
From the en.wikipedia.org
Is the small brown building with the big smokestack associated with a brickworks?
From the post-gazette.com
This means less carbon dioxide going up the smokestack to be separated and stored.
From the theatlantic.com
The landmark 562-foot smokestack, erected in 1917, was demolished in January 1993.
From the thenewstribune.com
The West has very cleverly shifted its smokestack manufacturing industry to China.
From the upi.com
The gas emitting from the smokestack is CO2 and they generate tons and tons of it.
From the guardian.co.uk
More examples
A large tall chimney through which combustion gases and smoke can be evacuated
A chimney is a structure for venting hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere. ...
Smokestack is a 1963 studio album by jazz pianist Andrew Hill released by the Blue Note Records label. It was his second recording as leader on the record label.
A conduit or group of conduits atop a structure allowing smoke to flow out
A pipe for the escape of the smoke or gases of combustion, as on a steamboat, locomotive, or building. (Vent).
A partially ejected cartridge or hull that protrudes from the ejection port that prevents the bolt or slide from closing. (Also called a stovepipe.)