VAPOR

Steam or mist

• ___ trail

• Clouds, e.g.

• Cloudy diffused matter

• Contrail content

• Contrail's makeup

• Exhaust, perhaps

• Fog

• Fog or mist

• Fog or steam

• Fog, e.g.

• Fog, mist, or steam

• Fume

• Gas

• Gas you can see

• Gaseous mist

• Haze, essentially

• Humidifier emission

• Humidifier output

• Inhalant

• Jet trail

• Kind of trail

• Kind of trail or lock

• Largest greenhouse gas, with water

• Like Jeanie's hair

• Miasma

• Mist

• Smoke or mist

• Something in the air

• Steam

• Steam, e.g.

• Steam, for example

• Trail type

• Type of trail

• Visible gas

• Water ___

• Water in the air

• Word with lock or barrier

• Word with lock or barrier

• A visible suspension in the air of particles of some substance