1The smokestack of the abandoned factory stood as a testament to the town's industrial past.
2Environmental regulations have led to the installation of scrubbers on many smokestacks to reduce emissions.
3The architect's design for the new power plant included a sleek, modern smokestack that doubled as a landmark.
4Air quality monitors were installed near the smokestack to track the facility's compliance with pollution standards.
5Historically, smokestacks were often seen as symbols of industrial progress, but today they are more commonly associated with environmental degradation.