By VICE News June 12, 2016 | 10:25 pm A 29-year-old man killed at least 50 people and wounded 53 others at an Orlando nightclub early Sunday morning in the worst mass shooting in US history. President Barack Obama said from the White House that the shooting was an act of terror and hate, and represented an attack on all Americans.
Expected Duration. Carbon monoxide gas leaves the body the same way it got in, through the lungs. In fresh air, it takes four to six hours for a victim of carbon monoxide poisoning to exhale about half of the inhaled carbon monoxide in their blood.
WHAT YOU NEED TO KNOW: Carbon monoxide (CO) poisoning is a life-threatening condition caused by exposure to high levels of CO. CO is a poisonous gas that you cannot see, taste, or smell. Exposure happens when you breathe in CO. CO can build up in your body and replace oxygen in your blood.