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Foreword Executive Summary 1 Introduction 1.1 BACKGROUND 1.2 OBJECTIVES 2 Air Quality Developments in 2000 and 2001 2.1 THE EUROPEAN UNION 2.2 THE AIR QUALITY STRATEGY 2.3 LOCAL AIR QUALITY MANAGEMENT REVIEW AND ASSESSMENT 2.4 MONITORING 3 Carbon Monoxide 3.1 MONITORING OF CARBON MONOXIDE 3.2 LIMIT VALUES AND OBJECTIVES FOR CARBON MONOXIDE 3.3 CARBON MONOXIDE RESULTS 3.4 CARBON MONOXIDE TRENDS 4 Nitrogen Dioxide 4.1 MONITORING OF NITROGEN DIOXIDE 4.2 LIMIT VALUES AND OBJECTIVES FOR NITROGEN DIOXIDE 4.3 AUTOMATIC NITROGEN DIOXIDE RESULTS 4.4 DIFFUSION TUBE NITROGEN DIOXIDE RESULTS 4.5 NITROGEN DIOXIDE TRENDS     4.5.1 Trends at Automatic Nitrogen Dioxide Sites     4.5.2 Trends at Diffusion Tube Nitrogen Dioxide Sites 5 Sulphur Dioxide 5.1 MONITORING OF SULPHUR DIOXIDE 5.2 LIMIT VALUES AND OBJECTIVES FOR SULPHUR DIOXIDE 5.3 AUTOMATIC SULPHUR DIOXIDE RESULTS 5.4 NON-AUTOMATIC SULPHUR DIOXIDE RESULTS 5.5 DIFFUSION TUBE SULPHUR DIOXIDE RESULTS 5.6 SULPHUR DIOXIDE TRENDS     5.6.1 Trends at Automatic Sulphur Dioxide Sites     5.6.2 Trends at Non-Automatic Sulphur Dioxide sites 6 Particulate Matter 6.1 MONITORING OF PARTICULATE MATTER     6.1.1 PM10 Monitoring     6.1.2 Smoke Monitoring 6.2 LIMIT VALUES AND OBJECTIVES FOR SUSPENDED PARTICULATE MATTER     6.2.1 Limit Values and Objectives for PM10     6.2.2 Limits and Guide Values for Black Smoke 6.3 PARTICULATE MATTER RESULTS     6.3.1 PM10 Results     6.3.2 Black Smoke Results 6.4 PARTICULATE MATTER TRENDS     6.4.1 PM10 Trends     6.4.2 Black Smoke Trends 7 Ozone 7.1 MONITORING OF OZONE 7.2 LIMIT VALUES AND OBJECTIVES FOR OZONE 7.3 OZONE RESULTS 7.4 OZONE TRENDS 8 Hydrocarbons 8.1 MONITORING OF HYDROCARBONS 8.2 LIMIT VALUES AND OBJECTIVES FOR HYDROCARBONS 8.3 HYDROCARBON RESULTS     8.3.1 Benzene and 1,3 Butadiene     8.3.2 Polycyclic Aromatic Hydrocarbons 8.4 HYDROCARBON TRENDS 9 Metals 9.1 MONITORING OF METALS 9.2 LIMIT VALUES AND OBJECTIVES FOR METALS     9.2.1 Lead     9.2.2 Other Metals 9.3 METALS RESULTS 10 Conclusions 11 Acknowledgements 12 References Appendices Appendix 1 Diffusion Tube Site Details and Data Appendix 2 Data from Smoke and SO2 Sites