"These ozone destroying gases may be responsible for
the "holes" (reductions) in the stratospheric ozone (ozone layer)."
NASA Goddard Space Flight Center
[emphasis mine]

"Humans have damaged the ozone layer by adding molecules
containing chlorine or bromine that lead to ozone destruction."
(This statement has now been removed from their website.)
Union of Concerned Scientists
[emphasis mine]

UPDATE: "Earth's ozone layer, high in the atmosphere,
which had thinned significantly by the 1980s and early 1990s,
has actually stabilized over the past two decades. "
Union of Concerned Scientists
[emphasis mine]

"Yes, significant depletion of the Arctic ozone layer now occurs
in some years in the late winter/early spring period (January-April).
However, the maximum depletion is less severe than that observed
in the Antarctic and is more variable from year to year. A large
and recurrent 'ozone hole', as found in the Antarctic stratosphere,
does not occur in the Arctic. "
NOAA Earth System Research Laboratory
[emphasis mine]