Report to the Department of Environment, Food and Rural Affairs by the National Physical Laboratory: annual report for 2004 on the UK Heavy Metals Network.

This Report was prepared by NPL as part of the 2004-2007 UK Heavy Metals Monitoring contract with the Department for the Environment, Food and Rural Affairs. This is the Annual Summary Report for 2004 and contains, in particular: · Measured monthly concentration levels of all metals at all sites and performance against relevant data quality objectives and the requirements of the First and Fourth EC Air Quality Daughter Directives (DDs). · Highlighting of exceedences, interpretation of data and discussion of trends · Summary of Network operation, analytical and QA/QC procedures and a description of notable events during 2004.