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.
There are a number of symptoms that are indicators of possible carbon monoxide poisoning. These symptoms vary depending on the amount of exposure to the actual poison. Recently, studies have been performed to show that chronic carbon monoxide poisoning can result in long term, residual effects on our bodies. Dr. David G. Penney has conducted one such study. He suggests that long periods of exposure to carbon monoxide, even at low levels, can result in long-term effects.