These Standards, adopted in 1981, set limits for the emission of smoke and certain gaseous pollutants for large turbo-jet
and turbofan engines to be produced in the future; they also prohibit the venting of raw fuels. The scope of the existing
Annex 16 was widened to include engine emission provisions and the document was retitled Environmental Protection.
Volume I of the reorganized Annex 16 contains provisions related to aircraft noise while Volume II contains provisions
related to aircraft engine emissions