Contents
Executive Summary
1 Introduction
2 Mapping background benzene & 1,3-butadiene
2.1 Current background benzene and 1,3-butadiene maps
2.2 2005 background benzene and 1,3-butadiene maps
3 Current roadside benzene & 1,3-butadiene concentrations
3.1 Roadside concentrations
3.2 Data collection
3.3 Analysis of annual mean benzene concentration
3.4 Analysis of daily roadside enhancement of concentration for benzene and 1,3-butadiene
3.4.1 Factors affecting the benzene:NOx road link emissions ratio and benzene:NOx roadside enhancement
4 Maps of estimated roadside benzene & 1,3-butadiene concentrations
4.1 Current background and roadside concentrations
4.2 Predicted roadside concentrations
4.2.1 Introduction
4.2.2 Comparison with NAQS objectives
5 Projections for individual monitoring site locations
6 Comparison with Benzene Target Value
6.1 Introduction
6.2 Estimated exceedences in 2010
6.2.1 Business as usual - "Scenario a"
6.2.2 Emission reduction scenarios
7 Conclusions
8 References
9 Acknowledgements
Appendices
Appendix 1 Monitoring site information
Appendix 2 Statistical comparison of annual means
Appendix 3 Exceedance of benzene target value (2010)
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