RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Gasmask
The Old School RuneScape Wiki also has an article on Gasmask.

Gasmask is an item obtained during the Plague City quest. Alrena rubs Dwellberries on it to further help protect player from the virus in West Ardougne.

While a player may not enter West Ardougne without a gasmask. Once inside they may take off their mask freely and without consequence.

If a player loses their gasmask another one may be obtained by searching the cupboard near Alrena.

See also