Select the correct text in the passage. The Montreal protocol Limited the world's use of chemicals like chlorofluorocarbons (CFCs). which sentence best indicates that the Montreal protocol led to improvements in the thickness of the ozone layer? when AutoZone was first measured by satellite in 1979, the average concentration above Antarctica was 225 Dobson units (DU). in 1989, when Montreal protocol took affect, it was 127 DU. The lowest level was 92 DU in 1994. file 2019, the value was back up to 167 DU. excerpt courtesy of NASA