A recent study by NASA has found that hydrofluorocarbons, or HFCs, which are commonly found in air conditioners and refrigerators, actually have a “small but measurable” impact on ozone depletion.

A substance thought to be harmless to the ozone layer has been found to have an impact described by NASA as “small but measurable.” 
A recent study has found that hydrofluorocarbons, or HFCs, will likely become more concentrated in the global atmosphere through the year 2050, ultimately resulting in “a weak depletion of stratospheric ozone.” 
HFCs are synthetic chemicals commonly used in air conditioners