A study by the University of Eastern Finland, the Finnish Meteorological Institute, and the University of Helsinki defined the formation speed for particles 2 nm (nanometres, or one millionth of a millimetre) with the help of the formation speed and growth speed of larger-sized particles, 7 nm in size.
The estimates were made on particles measured over a period of eight years (2007–2015) at the SMEAR*IV measuring station located at the Puijo Tower in Kuopio. The average formation speed of particles 7 nm in size was 0.44 cm-3s-1 and the estimated formation speed for 3 nm particles was 0.61 cm-3s-1. This means that about one particle is formed in one square centimetre of air (about the volume of a sugar cube) every two seconds.
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