In Roman mythology

Roman mythology

Roman mythology is the body of traditional stories pertaining to ancient Rome's legendary origins and religious system, as represented in the literature and visual arts of the Romans...

, Mefitis (or Mephitis) was the personification of the poisonous gases emitted from the ground in swamps and volcanic

Volcano

2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...

 vapors.
Mephitic, derived from Mefitis, is an adjective in the English language meaning "offensive in odor"; "noxious"; and "poisonous."

Mefite is also a solfatara, a gaseous fissure, associated with the Roman Goddess, Mefitis. It is located in Italy along the Via Appia between Rome and Brindisi. There, the ancient Romans would rest on their travels and pay homage to the goddess by performing animal sacrifices using the fissure's deadly gases. Today, it lies near the village of Rocca San Felice

Rocca San Felice

Rocca San Felice is a town and comune in the province of Avellino, Campania, Italy....

 in the province of Avellino

Province of Avellino

The Province of Avellino is a province in the Campania region of Italy. The area is typified by many small towns and villages scattered across the province; in fact only two towns have a population over 20,000; its capital city Avellino and Ariano Irpino....

(Campania region). The solfatara still emits deadly volcanic gases originating from the Vesuvian volcanic system.