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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.
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 exposure.