Kennecott Garfield Smelter Stack

The extra height was needed to meet the requirements of the Clean Air Act of 1970, to disperse waste gases according to new standards.

They are cooled and cleaned in a waste-heat boiler, electrostatic precipitator and scrubbing system before being sent to the sulfuric acid plant.

In 2006, the company produced and sold approximately 833,000 short tons (756,000 t) of sulfuric acid, made from the formerly released gas.

The acid recovery plant is designed to also recover waste heat from the process to produce electrical power.

It takes 20 minutes to ascend the stack, although workers only need to travel up to the 300-foot level each day, to service the air-sampling station.

Kennecott Utah Copper's Garfield Smelter Stack, Interstate 80 in foreground, with the Oquirrh Mountains behind
Aerial view of 1215-foot tall Garfield Smelter Stack, the north end of the Oquirrh Mountains and the Great Salt Lake , 2016