Also known as: Chlorofluorocarbons, CFCs, Halons
Other names include: Fluorotrichloromethane, Dichlorodifluoromethane,
What are freons?
Freons are colorless liquids or gases. Freons were used as coolants or pressurizers in
spray can products, including drugs. In the 1970s, scientists discovered that these
chemicals were destroying the earth's ozone layer. This was allowing potentially dangerous
levels of ultraviolet light to reach the earth. The making and using of freons is now
restricted, and freons are being replaced by safer chemicals.
Freons are gases at normal room temperature, liquids when cooled or compressed. Spilled
liquid freons do not remain at the spill site for more than a few minutes before they
evaporate. If liquid freons leak into soil before evaporation, it can seep into
How are people exposed to freons?
Breathing: Breathing gases from spray products is the way most people
are exposed to freons. People can also breathe freons that have leaked from refrigerators
or air conditioners. It is possible for people to breathe freons from contaminated water.
Touching: When people touch liquid freon, the chemical evaporates
before it has a chance to pass through the skin. Some freons evaporate so fast that they
can cause frostbite.
Drinking/Eating: Freons are not usually found in drinking water.
However, freons may occasionally contaminate groundwater near industrial plants and people
may drink this water. Plants do not take up freons when theyre grown in contaminated
Do standards exist for regulating freons?
Water: There are no federal drinking water standards for any of the
freons. However, there are state groundwater standards for fluorotrichloromethane (Freon
11) at 3,490 parts per billion (ppb) and dichlorodifluoromethane (Freon 12) at 1,000 ppb.
We suggest you stop drinking water that contains more than these levels of these freons.
Air: No standards exist for regulating the amount of
freons allowed in the air of homes. However, the Wisconsin Department of
Natural Resources (DNR) has set a residential indoor air action level for:
dichlorodifluoromethane (Freon 12) at 20 parts per billion by volume (ppbv)
and trichlorofluoromethane (Freon 11) at 130 ppbv. The action level is
considered to be protective of public health. Breathing these freons at
these concentrations for a lifetime is very unlikely to be harmful to
people. If dichlorodifluoromethane or trichlorofluoromethane concentrations
in air are above their respective action levels, we recommend taking an
action to halt exposure.
The Federal Clean Air Act Amendments of 1990 specify the concentrations
of freons that can be released into outdoor ambient air by industries.
Will exposure to freons result in harmful health effects?
The following health effects may occur immediately or shortly after people are exposed
to elevated levels of freons:
- Irritation to mouth, throat, lungs, and nose following inhalation of freons
- Heart palpitations and dizziness after inhalation of gases
- Freezing of skin and possible frostbite following skin contact with liquid freons
Years of exposure to freons are not likely to increase a person's risk of getting
cancer. No other long-term effects have been studied.
In general, chemicals affect the same organ systems in all people who are exposed.
However, the seriousness of the effects may vary from person to person.
A person's reaction depends on several things, including individual health, heredity,
previous exposure to chemicals including medicines, and personal habits such as smoking or
It is also important to consider the length of exposure to the chemical; the amount of
chemical exposure; and whether the chemical was inhaled, touched, or eaten.
Can a medical test determine exposure to freons?
No medical tests are available to determine freon exposure. Medical tests of lungs,
skin, and nervous systems can help doctors determine the extent of damage caused by high
level exposure to freons.
Seek medical advice if you have any symptoms that you think may be related to chemical
(P-44602 Revised 05/2012)
This fact sheet summarizes information about this chemical and is not a complete
listing of all possible effects. It does not refer to work exposure or emergency
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