Minneapolis foundry failed to protect workers from breathing hazards, state inspectors say

Breathing in silica raises the risk of developing silicosis, which OSHA describes as "an incurable lung disease that can lead to disability and death." Inhaling the substance also raises the risk of lung cancer, chronic obstructive pulmonary disease or COPD and kidney disease, according to the agency.

Breathing carbon monoxide can cause a host of problems, including nausea, dizziness, weakness and disorientation.