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In a giant step toward managing today's pollution problems more effectively, this report lays out a framework to coordinate an interdisciplinary and international investigation of the chemical composition and cycles of the troposphere. The approach includes geographical surveys, field measurements, the development of appropriate models, and improved instrumentation.Table of Contents FRONT MATTER PART I A PLAN FOR ACTION Executive Summary 1 THE NEED FOR A PROGRAM 2 A FRAMEWORK 3 A PROPOSED PROGRAM 4 A CALL TO ACTION PART II ASSESSMENTS OF CURRENT UNDERSTANDING 5 CRITICAL PROCESSES AFFECTING THE DISTRIBUTION OF CHEMICAL SPECIES 6 THE ROLE OF MODELING IN UNDERSTANDING TROPOSPHERIC CHEMICALPROCESSES 7 TROPOSPHERIC CHEMICAL CYCLES 8 INSTRUMENTATION DEVELOPMENT NEEDS FOR USE OF MASS-BALANCETECHNIQUE 9 INSTRUMENT AND PLATFORM SURVEY APPENDIXES INDEX