Trbovlje Chimney, Flue-gas stack in Trbovlje, Slovenia.

The Trbovlje Chimney is a concrete tower rising 360 meters above the Sava valley, built to disperse emissions from a nearby power station. Its tall, slender shape dominates the landscape and can be seen from across the entire region.

Construction began in September 1974, when 62 reinforced-concrete cylinders 1.7 m wide and 13 m long were set into the live rock. The German firm Karrena of Düsseldorf designed the stack, with Slovenian and Bosnian specialists taking part. It replaced an 80 m chimney and was handed over on 1 June 1976, the Trbovlje municipal holiday, at a cost of over 100 million Yugoslav dinars.

The chimney appears on Trbovlje's municipal holiday, 1 June, the date it was handed over in 1976. It also featured in the German TV show 'Das Duell um die Welt', where host Johannes B. Kerner climbed it and ironed a shirt at the top before being lowered by helicopter.

The chimney sits near Trbovlje's town center and is easy to spot when approaching the city from any direction. Several viewpoints in the surrounding area offer good views of the structure, making it a helpful landmark while exploring the region.

For a 2020 Red Bull documentary, an artificial climbing route with holds was fixed over the full 360 m height, across more than 13 rope lengths. Slovenian climbers Janja Garnbret and Domen Škofic completed it on their second attempt without falling on any pitch; the route was then removed.