1. Achermann, B., Bobbink, R., 2003. Empirical Critical Loads for Nitrogen. In: Proceedings from the expert workshop, Berne, 11–13 November 2002. Environmental Documentation No. 164 Air. Swiss Agency for the Environment, Forests and Landscape, Berne, 2003.
2. London Atmospheric Emissions Inventory 2006;AEA,2009
3. Air Quality Archive, 2007. London Bloomsbury data: http://www.airquality.co.uk/archive/data_and_statistics.php?f_exceedence_id=S3&f_year=2006&f_network_id=Array&f_group_id=4&f_region_reference_id=5&f_sub_region_id=141&f_output=screen&f_parameter_id=SO2&action=exceedence3&go=Go;
4. London Lewisham data:; London Lewisham data: http://www.airquality.co.uk/archive/data_and_statistics.php?f_exceedence_id=S3&f_year=2006&f_network_id=Array&f_group_id=4&f_region_reference_id=5&f_sub_region_id=153&f_output=screen&f_parameter_id=SO2&action=exceedence3&go=Go.
5. Amann, M., Bertok, I., Cofala, J., Gyarfas, F., Heyes, C., Klimont, Z., Schöpp, W., Winiwarter, W., 2005. Baseline scenarios for the Clear Air for Europe (CAFE) Programme. CAFE Scenario Analysis Report number 1. International Institute for Applied Systems Analysis.