As part of its commitment to the UN-ECE Convention on Long-range Transboundary Air Pollution the United Kingdom will operate two ‘supersites’ reporting data to the Co-operative Programme for Monitoring and Evaluation of the Long-range Transmission of Air Pollutants in Europe (EMEP).\ud This report provides the annual summary for 2007, the first full calendar year of operation of the first EMEP ‘supersite’ to be established in the United Kingdom. Detailed operational reports have been submitted to Defra every 3 months, with unratified data. This annual report contains a summary of the ratified data for 2007.\ud The EMEP ‘supersite’ is located in central southern Scotland at Auchencorth (3.2 oW, 55.8oN), a remote rural moorland site ~20 km south-west of Edinburgh. Monitoring operations started formally on 1 June 2006.\ud In addition to measurements made specifically under this contract, the Centre for Ecology & Hydrology also acts as local site operator for measurements made under other UK monitoring networks: the Automated Urban and Rural Network (AURN), the UK Precipitation Network, the UK Hydrocarbons Network, and the UK Heavy Metals Rural Network. Some measurements were also made under the auspices of the ‘Acid Deposition Processes’ contract. All these associated networks are funded by Defra.\ud This report summarises the measurements made between January and December 2007, and presents summary statistics on average concentrations.\ud The site is dominated by winds from the south-west, but wind direction data highlight potential sources of airborne pollutants (power stations, conurbations).\ud The average diurnal patterns of gases and particles are consistent with those expected from a remote rural site.\ud The frequency distributions are presented for data where there was good data capture throughout the whole period. Some components (e.g. black carbon) show log-normal frequency distributions, while other components (e.g. ozone) have more nearly normal frequency distributions.\ud A case study is presented showing the influence of regional pollution on measurements at Auchencorth, from a period in mid-June 2007 when there was a consistent northerly air flow to the site.\ud All the data reported under the contract are shown graphically in the Appendix
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