Mapping the Birth of Aerosols in the Boreal Forest (3 of 3) (image) American Association for the Advancement of Science Share Print E-Mail Caption The scanning Particle Size Magnifier, the first instrument for measuring aerosol particles as small as one nm in diameter. This image relates to a paper that appeared in the Feb. 22, 2013, issue of Science, published by AAAS. The paper, by Markku Kulmala at University of Helsinki in Helsinki, Finland, and colleagues was titled, "Direct Observations of Atmospheric Aerosol Nucleation." Credit [Image courtesy of Joonas Vanhanen] Usage Restrictions Please cite the owner of the image when publishing. This image may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.