Guidelines & Tools OSVALD (Ozone Symptom VALidation Database) Share SHARE Facebook share Twitter LinkedIn Copy URL Email Download Download index.php en Added on: 20 May, 2025 Breadcrumb Home Resource Library OSVALD (Ozone Symptom VALidation Database) The OSVALD (Ozone Symptom VALidation Database) is an on-line validation tool for ozone visible injury on wood species, developed by the ICP Forests Task Force, a working group under the UNECE/CLRTAP. Related partners United Nations Economic Commission for Europe (UNECE)