The data are licensed under Creative Commons 4.0 Attribution (CC BY) license. For scientific purposes, data users are expected to follow the principles of fair use. Offer of co-authorship must be made through personal contact with the data providers whenever substantial use is made of the data. In all cases, an acknowledgement must be made to the data providers when these data are used within a publication.

For the web interface cite: Junninen, H., Lauri, A., Keronen, P., Aalto, P., Hiltunen, V., Hari, P., Kulmala, M. 2009. Smart-SMEAR: on-line data exploration and visualization tool for SMEAR stations. Boreal Environment Research 14, 447–457.

All data is provided "as is" and any data is subject to update or revision. The responsibility of proper data interpretation is solely on the data user. Users are encouraged to contact the  original data contributors or atm-data@helsinki.fi  for questions or clarifications.