Hanna Tuula Katariina Vehkamäki (formerly Arstila) (born 27 December 1969) is a Finnish physicist who is a professor of computational aerosol science at the University of Helsinki.

[7] She studied at the University of Helsinki, where she earned a master's degree in 1994 and a doctorate in 1998.

[7] Vehkamäki was awarded a research fellowship at University College London and moved to the United Kingdom in 1998.

She returned to Helsinki in 1999, where she worked in the physics department as a lecturer and researcher.

[citation needed] Vehkamäki was appointed to the faculty at the University of Helsinki in 2000.