A—absorbing abilityB—acceptable daily intakeC—acid fogD—Action Plan for the Biosphere ReservesE—Action Plan for the Protection of the AtmosphereF—adverse climate changeG—Advisory Committee on Marine PollutionH—African Ministerial Conference on EnvironmentI—air monitoringJ—air pollutionK—anti- desertification programL—applied cloud physicsM—atmospheric changeN—balance of natureO—biological oxygen demand