The concentration of HCFC-142b in the atmosphere grew to over 20 parts per trillion by year 2010.   It has an ozone depletion potential (ODP) of 0.07.  This is low compared to the ODP=1 of trichlorofluoromethane (CFC-11, R-11), which also grew about ten times more abundant in the atmosphere by year 1985 (prior to introduction of HFC-142b and the Montreal Protocol).
HFC-142b is also a minor but potent greenhouse gas.  It has an estimated lifetime of about 17 years and a 100-year global warming potential ranging 2300 to 5000.  This compares to the GWP=1 of carbon dioxide, which had a much greater atmospheric concentration near 400 parts per million in year 2020.