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.
Symptoms of Carbon Monoxide Poisoning. Low levels of carbon monoxide poisoning can be confused with flu symptoms, food poisoning or other illnesses and carry a long-term health risk if left unattended. Moderate levels of CO exposure can cause death if the following symptoms persist for a long measure of time.