Abstract
The eight papers in this issue of Photochemical & Photobiological Sciences are authored by members and co-authors of the Environmental Effects Assessment Panel (EEAP) of the Montreal Protocol under the United Nations Environment Programme. These papers assess the linkages between stratospheric ozone depletion and UV radiation, and climate change, with respect to the effects on the environment and human health. This Quadrennial Assessment is written primarily for policymakers and governments of the 198 countries that have ratified the Montreal Protocol. The publication of this Quadrennial Assessment, together with our annual updates, makes our findings readily available to the scientific community.