Fumes is a plural noun of word "Fume."
Fume- 1. An amount of gas or vapour that smells strongly or is dangerous to inhale.
2. A pungent odour of a particular thing.
3. A water vapour, steam, or mist rising from the earth or sea.
4. Emit gas or vapour.
5. Expose (especially wood) to ammonia fumes in order to produce dark tints.
6. Feel, show, or express great anger.
The mosquitoes may be destroyed by the fumes of burning sulphur.