Research suggests that over the past 10 years the concentration of 1,1,1,2-tetrafluoroethane has increased significantly in the Earth's atmosphere, with a recent study revealing a doubling in atmospheric concentration between 2001 and 2004.
研究显示过去十年中地球大气中1,1,1,2-四氟乙烷的浓度显著增加，有研究表明2001年至2004年间其浓度就增加了一倍。