The study of ozone is important because of the large role it plays in protecting the Earth from harmful levels of ultraviolet solar radiation and because of its role as a greenhouse gas in the Earth's climate system, as well as the harmful effects of tropospheric ozone on human health, ecosystems, and agricultural production. In 2016, the International Ozone Commission (IO₃C) organised its Quadrennial Ozone Symposium (QOS 2016) with more than 300 participants presenting the latest findings and emerging research on the full range of ozone-related topics. This special issue invites submissions of papers presented at the QOS 2016 related to the following broad subject areas:

• stratospheric ozone
• tropospheric ozone
• ozone chemistry–climate interactions
• global ozone observations and measurement techniques.

Please contact the corresponding guest editor (srei@ceh.ac.uk) prior to submitting a manuscript to this special issue.