This is a publication package for the article 'Mood and Emotional Reactivity of Adolescents During the COVID-19 Pandemic: The Short-Term and Long-Term Effects and the Impact of Social and Socioeconomic Stressors' Open access available at: https://www.nature.com/articles/s41598-021-90851-x This is a multi-sample study on the impact of the COVID-19 pandemic on young people’s mood and emotional reactivity. We conducted an online two-week daily diary study among 462 Dutch adolescents and 371 young adults in May 2020, with a follow-up to study long-term effects in November 2020 (N = 238 and 231, respectively adolescents and young adults. This publication package contains: study information, the measures, the computer code and data files. Files are accessible to the authors of the study. Interested parties can request access by e-mailing
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