Why is phosgene the most dangerous gas?

Answer 1

Phosgene is certainly a dangerous gas, that was specifically designed to be poisonous to people, so that it could be used as a weapon of war, but it is not the most dangerous gas. Fluorine gas is more dangerous. But fluorine is so dangerous that it would not be practical to use it as a weapon (not that phosgene is a very practical weapon either; poison gas blows on the wind, and easily turns back toward the people who are using it). Anyone trying to use fluorine gas as a weapon would almost certainly wind up being killed by it. It is almost impossible to handle safely.

Answer 2

Phosgene is one of the most dangerous gases because it can cause severe respiratory damage, leading to fluid buildup in the lungs and potentially fatal consequences. Phosgene exposure can also have delayed symptoms, making it difficult to detect and treat early. Additionally, phosgene was historically used as a chemical warfare agent due to its toxicity and effectiveness in causing harm.