Unknown Chemical Weapon

The Unknown Chemical Weapon was a chemical weapon used during World War III as part of Makarov's plan to bring Europe into a third world war.

World War III
The weapon was first used during the October 6, 2016 Terrorist Attacks. Trucks containing the weapon were detonated in several major European cities, including London and Paris.

Trivia

 * If the player comes across the gas, but is not wearing a gas mask, it will slowly cause more an more damage to the player in a way similar to Nova Gas grenades.