HQ Thresholds: Establishing critical loads from theshold values

Under the Convention on Long Range Transboundary Air Pollution (CLRTAP), the UK will be requested by the Coordination Centre for Effects (CCE) to respond to a “Call for Data” by March 2015. The HQThresholds project (AQxxxx) will prepare for this response, developing Critical Load (CL) functions which describe the maximum nitrogen and sulphur deposition compatible with long-term protection of habitats. These functions will be based on acceptable limits for biodiversity, defined using a Habitat Quality Index (HQI...