Explosive Gas

Explosive gases are commonly encountered in enclosed areas such as underground locations and buildings, such as Warrington Trainyard. It has also been encountered in few outside locations usually near ovens or gas lines.



How to spot the gases

 * The air will start to distort as you stand still and see through the gases.


 * When you fire a weapons that is a source of ignition (flamer, energy weapons, etc) the immediate area will ignite in flames.

Bugs

 * The flame will spread through closed doors, if there is gas on the other side. Therefore closing a door after igniting isn't always a good strategy if the gas is also in your room. (Confirmed on Xbox)


 * Energy Weapons from add-ons do not seem to ignite gas clouds from a distance. (Observed Xbox 360)

Appearances
Explosive gases appears in Fallout 3.