The concentration of HCFC-141b in the atmosphere grew to near 25 parts per trillion by year 2016.   It has an ozone depletion potential (ODP) of 0.12.  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 prior to introduction of HFC-141b and subsequent adoption of the Montreal Protocol.  
HFC-141b is also a minor but potent greenhouse gas.  It has an estimated lifetime of about 10 years and a 100-year global warming potential ranging 725 to 2500.  This compares to the GWP=1 of carbon dioxide, which had a much greater atmospheric concentration near 400 parts per million in year 2020.