WOUIRG PARTY I: AlIALYSIS or POLLUTAIITS Chairman: A. LIBERTI (CNR - Roma, I) Summary by the Chairman 3 Detection of gaseous nitric acid by OH (A~X) - fluorescence gen­ erated by ArF-laser irradiation Th. PAPENBROCK and F. STUHL 5 Preparation of standard atmospheres of nitrogen acid compounds: the N02 permeation tube I. ALLEGRINI, P. BUTTINI, V. DI PALO and M. POSSANZINI 15 Automated denuder systems J. SLANINA, A. M. VAN WENSVEEN, C. A. M. SCHOONEBEEK and P. I. VOORS 25 A battery-powered light-weight ozone analyzer for use in the troposphere and stratosphere S. SARAND, W. SPEUSER and U. SCHURATH 33 H202 in solid precipitation A. NEFTEL, A. SIGG and P. JACOB 45 Detection of nitrated and oxygenated polyaromatic hydrocarbons (PAR) in suspended particulate matter sampled in urban areas and their relation with anthropogenic emission and photochemical smog formation A. CECINATO, E. BRANCALEONI, C. DI PALO, R. DRAISCI and P. CICCIOLI 58 Field intercomparison of sampling and analytical methods for S02 and S04 in ambient air K. NODOP and J. E. HANSSEN 69 Field measurements on the use of denuders for the evaluation of acid deposition Istituto sull'Inquinamento Atmosferico del C. N. R. , Mon- rotondo, Italy 79 -vii- Use of air - S02 mixtures for intercomparison of S02 monitors in the EEC M. PAYRI S SAT , H. RAU and G. SERRINI 103 Determination of polychlorinated dibenzo-P-dioxins and dibenzofurans in outdoor air P. KIRSCHMER and M.

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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 of cloud and rain water chemical composition.- Deposition measurements in Sweden.- Measurements of the dry deposition rates of some trace gas species.- Contribution of ammonia to the wet deposition of sulphur compounds.- Impact of saharan dust on the rain acidity in the mediterranean atmosphere.- Acid deposition in a snow field at 2500 m.a.s.l. in Switzerland.- Acidity measurements of snowfalls collected over the VOSGES in relation to air mass trajectories.- Nitrate and sulphate wet deposition in Europe.- Seasonal and daily variations of ozone, sulfur dioxide and nitrous gases and the photochemical production and reactions with other trace gases of the ozone.- A wet-only precipitation study in a mediterranean site, Patras, Greece.- Oxidant data collection in OECD-Europe 1985-87 (Oxidate): a cooperative project for rapid exchange of regional data on ozone, nitrogen dioxide and PAN.- Daily trends of photochemical oxidants and their precursors in a suburban forested area. A useful approach for evaluating the relative contributions of natural and anthropogenic hydrocarbons to the photochemical smog formation in rural areas in Italy.- Observations of nitrous acid at roof and street level during air pollution episodes in Gothenburg.- Speciation of ionic organolead compounds in the biosphere.- Preliminary results on fog deposition.- Determination, by PAHanalysis, of the age of air mass contamination in a area remote from sources of pollution.- Aircraft measurements of various sulfur compounds in a marine and continental environment.- Flux d'azote inorganique dissous d'origine atmosphérique en système littoral d'europe occidentale.- Meso-meteorological analysis of air pollution cycles in Spain.- Working Party 5: Transport and Modelling.- Summary by the Chairman.- Model calculations of long-term changes in atmospheric hydroxyl, hydrogen peroxide and ozone from changes in the emissions of nitrogen oxides and methane.- A mass balance of SO2 over Baden-Württemberg during the tulla experiment.- Mesoscale modelling of nitric acid generation in night-time moist atmosphere.- Long range modelling of the formation transport and deposition of photochemical oxidants and acidifying pollutants.- Analysis of an acid deposition episode and preparation of meteorological input data for an eulerian longrange transport and deposition model.- Physico-chemical properties of radiation fog in the Po Valley, Italy.- Air sampling flights at low altitudes along the border between the Federal Republic of Germany and its neighbours.- The oxidation of sulphur dioxide in the aqueous phase in plumes.- Monte-Carlo methods for simulating diffusion in the atmospheric boundary layer.- Modelling for langrangian turbulent dispersion of neutral and buoyant pollutants released in the atmospheric boundary layer.- A three-dimensional mathematical model of dispersion in turbulent shear flow.- The rapid rotation of the wind direction and sharp ozone peak features.- Local scale plume model for nitrogen oxides - comparison with measurements.- High PAN concentrations during non-summer periods: a study of two episodes in Creteil (Paris) - France.-Verification of the pollutant transport model 'MODIS' using EPRI plains site data from a tall stack.- Long-range transport of nitrogen and sulphur compounds.- Modélisation de la chimie d'un panache.- Echantillonnage et mesures sequentiels de pluies: conception d'un appareil équipé d'un automate programmable (SAPSEP).- List of Participants.- Index of Authors.