The quadrennial International Radiation Symposium 2022 was successfully completed after two postponements since 2020 due to the COVID-19 pandemic. IRS 2022 was jointly organized in Thessaloniki (Greece) from 4 to 8 July 2022 by the Laboratory of Atmospheric Physics (LAP) of the Aristotle University of Thessaloniki (AUTH) and the International Radiation Commission (IRC) of the International Association of Meteorology and Atmospheric Sciences (IAMAS). The symposium was hosted in the Concert Hall Convention and Cultural Center of Thessaloniki. Over 360 scientists from 29 countries participated physically and presented their scientific achievements in over 250 oral and 150 poster presentations.

IRS 2022 provided a comprehensive international forum for presenting and discussing recent research achievements and technological developments on solar and atmospheric radiation covering a wide spectrum of related topics. Internationally recognized senior scientists, young scientists, and students had a unique opportunity to discuss hot scientific issues, exchange new ideas and establish far-reaching collaborations.