The Auchencorth Moss site, located in an elevated rural environment, 1.5 kilometres north west of the A701 at Leadburn and 18 kilometres south of Edinburgh city centre, Scotland, near Penicuik. It has been operational since 1985 as part of a variety of different monitoring networks, including being one of two two Level III 'supersites' located in the UK of the EMEP (the Co-operative Programme for Monitoring and Evaluation of the Long-range Transmission of Air Pollutants in Europe) monitoring network. Hourly and daily measurements are supplemented by long-term integrated measurements from existing DEFRA-funded monitoring networks across the UK (http://www.nilu.no/projects/ccc/network/index.html). Auchencorth Moss is the northern of these two sites (the other is near Harwell, Oxfordshire), which has been used by the Centre for Ecology & Hydrology for several years as an intensive monitoring site for trace gas and particle concentrations and fluxes. The site is based in an area of upland deep peat, with heather and grass cover, and has an extensive fetch to the south-west. The site is located at 55.792160 N, 3.242900W (OS Grid map reference: NT 322166, 656128) and at an altitude of 260m above mean sea level. The site is mostly funded by DEFRA but with significant CEH support, part-funded by EU ACTRIS Programme. The CEH field team carry out routine monitoring work for DEFRA and other funding agency contracts. Intermittent research activities are carried out by scientists both from CEH and other UK and international organisations. As a result of the large number of parameter measured at the site it is part of a wide range of monitoring networks. For details of these networks visit the DEFRA station details page. Details of individual activities should be found either on relevant databases (including the BADC) or by contacting CEH for further information. The station's UK-AIR ID is UKA00451 and its EU Site ID (EMEP network identifier) is GB0048R.