translate English to French: The concentration of the EESC reached its maximum in the late 1990s and is now decreasing, although the inorganic bromine in the stratosphere appears to be stable.
La concentration de CSEE a atteint son maximum Ã la fin des annÃ©es 1990 et a depuis commencÃ© Ã diminuer mÃªme si le brome inorganique semble sâ€™Ãªtre stabilisÃ© dans la stratosphÃ¨re.