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Working Party 1: Analysis of Pollutants.- Summary by the Chairman.- Detection of gaseous nitric acid by OH (A?X) - fluorescence generated by ArF-laser irradiation.- Preparation of standard atmospheres of nitrogen acid compounds: the NO2 permeation tube.- Automated denuder systems.- A battery-powered light-weight ozone analyzer for use in the troposphere and stratosphere.- H2O2 in solid precipitation.- Detection of nitrated and oxygenated polyaromatic hydrocarbons (PAH) in suspended particulate matter sampled in urban areas and their relation with anthropogenic emission and photochemical smog formation.- Field intercomparison of sampling and analytical methods for SO2 and SO4 in ambient air.- Field measurements on the use of denuders for the evaluation of acid deposition.- Use of air - SO2 mixtures for intercomparison of SO2 monitors in the EEC.- Determination of polychlorinated dibenzo-P-dioxins and dibenzofurans in outdoor air.- Measurement of atmospheric nitrous and nitric acid by means of annular denuders.- Evaluation of analytical methods for the determination of degradation products of chlorinated hydrocarbons.- Sampling of aldehydes and carbonyl compounds in air and their determination by liquid chromatographic techniques.- The use of a filter pack for the monitoring organic and inorganic acid species in air.- IR-Tunable diode laser techniques for trace gas detection at PPBV level.- Measurement of airborne hydrocarbons by headspace-chromatography.- A study of atmospheric deposition chemistry in peninsular and insular Italy.- Chemistry of atmospheric depositions at L. TOGGIA (2160 m.a.s.l.), with emphasis on the sampling procedure.- Analysis of carbonyl compounds in the atmospheric liquid phase.- Working Party 2: Chemical and Photochemical Reactions; Mechanisms and Rates.- Summary by the Chairman.- Photo-oxidation of sulphur containing compounds.- Kinetic studies of oxidation reactions of sulphur compounds: reaction SO2 + OH in the presence of O2 and reaction 10 + DMS.- A comparison of models for the oxidation of acetylene at 300 K.- Rate constants for reaction of OH radicals with acetates and glycols in the gas phase.- OH-Dynamics during hydrocarbon oxidation in air.- Aqueous phase chemistry of biogenic sulphur compounds.- The contribution of hydrogen peroxide to atmospheric liquid phase chemistry.- A study of the HO2 + CH3CHO reaction in the photolysis of CH3CHO, and its consequences for atmospheric chemistry.- Laboratory studies of the nitrate radical.- Quelques aspects de la chimie des aldehydes dans la basse troposphere.- Kinetics of the formation of nitrous acid from the thermal reaction of nitrogen dioxide and water vapour.- FT-IR laboratory studies of kinetics of the NOx/O3 system of tropospheric interest.- OH-Initiated oxidation of P-xylene under atmospheric conditions.- Products and kinetics of the OH initiated oxidation of SO2, CH3SH, DMS, DMDS and DMSO.- Absolute rate constant for the reaction of OH with SO2 in the presence of water at atmospheric pressure.- The role of transition metal ions in atmospheric droplet chemistry.- Working Party 3: Aerosol Characterization and Particle Formation.- Summary by the Chairman.- Below and in cloud scavenging of particulates and gases.- Mesure d'aérosols dans la fôret des vosges.- Anionic composition in size-fractionated atmospheric aerosol.- Correlation analysis applied to a sulphate and nitrate aerosol measuring network in the Netherlands.- Cendres volantes industrielles et microspherules volcaniques: critères de distinction par microscopie analytique.- Radiolytic aerosols: their production and inhibition.- Chlorides in atmospheric aerosols.- Working Party 4: Pollutants Cycles.- Summary by the Chairman.- Emissions of biogenic sulfur compounds from various soils.- Dimethyl sulfide lifetime in the marine atmosphere.- Natural and anthropogenic hydrocarbons and halocarbons over the atlantic ocean: latitudinal distributions of mixing ratios and sources.- Characterization
