Institute for Atmospheric and Earth System Research (INAR) is a multi-disciplinary research unit based in physics, chemistry, meteorology, forest sciences, environmental sciences and social sciences in the University of  Helsinki.

It performs multiscale research from molecular to global scale and focuses on climate change, air quality, biogeochemical cycles and ecosystem processes. INAR is directing Finland’s national flagship, the  Atmosphere and Climate Competence Center (ACCC), with 2 research institutions and the Finnish Meteorological Institute as partners, and over 40 private and policy sector stakeholders as collaborators.

INAR and science diplomacy: As coordinators of the ACCC Impact programme, the institute is working to establish a Science Diplomacy Forum in Climate Change and Air Quality. The Forum would serve to provide  scientific knowledge for desicion-making. It founded and lead the initiative Pan-Eurasian Experiment (PEEX) program, a multidisciplinary climate change, air quality, environment and research infrastructure initiative focused on the Northern Eurasian particularly Arctic, Russia and China. INAR published the PEEX Science Plan (2015) and on-going science for policy papers.
INAR leads the International Eurasian Academy of Sciences (IEAS) European Centre. Current activities of IEAS-Europe focus on research and education in environmental sciences and is also an expert partner with the Cyprus Insitute working to establish regional Centre of Excellence for climate research in the Eastern Mediterranean and Middle East region (EMMECARE project).