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The Gas mask is a quest item made by Edmond's wife during the Plague City quest so that the player can enter West Ardougne without being affected by the "plague" there (however it does not need to be worn after Biohazard as the plague is revealed to not exist). They are also dropped by the mourner who drops the garb for Mourning's Ends Part I. It also protects the player from damage in the Smokey Well and Desert Slayer Dungeon in Desert Treasure and beyond.

If you happen to lose your gas mask after Plague City, you can search the wardrobe in Edmond's house to retrieve another one.

Interestingly, the homemade gasmask made by Alrena using dwellberries is the same item (stacking in a bank account, etc.) as the one dropped by mourners. This, plus the fact that each is actually functional in environments such as the smokey well, suggests that they are made from the same design, and that the dwellberries don't add any benefits at all to the apparatus. It could also suggest that the mourners feel a need to comply with folklore about the plague, and so add the berries to their gas masks regardless of the plague's nonexistent nature.

This item has not been proven to protect from other hazards that a real-life gas mask would stop, such as the poison gas released by Mi-Gor during The Great Brain Robbery.

On the 9th of November 2010, the gas mask received a graphical update which didn't appear on the front page but did in the forums under patch notes. The mourner clothing and plague clothing have also been updated but only changed to a darker colour.

Combat Stats
Class Slot Unknown edit Weapons Main Off Damage - - Accuracy - - Type - - Attributes Armour rating0 Life bonus+0 Prayer bonus0 Critical bonuses 0% 0% 0%	File:Gasmask worn.png
Compare item	A male player wearing a gas mask	The location of where to find the mask
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Dropping monsters

Monster	Combat level	Quantity	Rarity
Mourner	11,12,13,18,24,108	1	1Always

Trivia

• The current design of the gas mask is based on those worn by plague doctors in Europe during the Black Death. The beak contained fragrant items believed to ward off the smells that were erroneously thought to carry the disease. Such references have been made through the Plague City Quest much like the Black Death. Not only is the Gas mask a reference, but also is the situation happening in West Ardougne.
• The old Gas mask's design
  
  looked like the gas masks worn by civilians and soldiers during World War I to protect against chemical warfare attacks.
• Just as its examine text suggests, it can act as a substitute for the facemask (but not a nose peg), unfortunately it does not protect against the Dust Devils' attacks, only the smoke in the dungeon.

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Gas mask