I t is a great honour and joy for me to present this volume of Scripta Varia which contains the papers presented during the Study Week on “Chemical Events in the Atmosphere and their Impact on the Environment” held at the seat of the Academy from the 7th to the 11th of November, 1983. The discussions which followed each presentation are included in the volume. These proceedings are of great interest; they touch on problems which may seem diverse for a non-knowledgeable person, or insignificant to those who flee the reality of our present world. Nevertheless, the problems dealt with are a menace to mankind and challenge our future
