Related Links: OSHA Proposes Tougher Rules for Silica Dust Exposure OSHA Studies Frac Sand Rules Construction is a risky business full of jobsite hazards, from life-threatening falls to blunt-trauma injuries, but more insidious dangers exist, such as crystalline silica inhalation, which can lead to a type of cancer known as pneumoconiosis. It's what coal miners call black lung disease, where tiny airborne particles cause lesions and scarring on the lungs, gradually leaving workers unable to breathe.Silicosis, its equally harmful cousin, currently affects 1.7 million workers annually, reports the Centers for Disease Control and Prevention (CDC). It is caused by breathing
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.