Vein: A blood vessel that carries blood that is low in oxygen content from the body back t... See the entire definition of Vein Viral: Of or pertaining to a virus.
This means that breathing low concentrations of freon from a leaking refrigerator or air conditioner over a long period of time is unlikely to have a cumulative effect, and thus few, if any, long term health effects.
Quick Answer. Freon gases have a sweet odor similar to ether or freshly mowed grass. The odor becomes noticeable at concentrations of higher than 20 percent. At 11 percent concentration and higher, Freon gases are toxic, so the effects can become debilitating before the odor is detected. Continue Reading.