Lauri Kaleva Laakso

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Atmospheric aerosol formation is known to occur almost all over the world, and the importance of these particles to climate and air quality has been recognized. Although almost all of the processes driving aerosol formation take place below a particle diameter of 3 nanometers, observations cover only larger particles. We introduce an instrumental setup to(More)
The national Finnish Schools on the Move programme support schools with their individual plans to promote school-based physical activity (PA). We examined the changes in adolescents' recess and overall PA in four lower secondary schools and described the school actions to promote students' PA and the local contact persons' perceptions of the effects. Recess(More)
BACKGROUND Participation in physical activities provides students with opportunities for social interaction and social skills development. The purpose of this study was to investigate the associations of students' recess physical activity with school-related social factors. METHODS Data were collected in 19 schools countrywide in autumn 2010, and 1463(More)
The purpose of the study was to investigate the time trend of questionnaire-assessed moderate to vigorous physical activity (MVPA) among 12-18-year-old Finnish boys and girls from 1979 to 2005. The MVPA was defined as "at least moderately breathtaking and sweating in leisure time physical activities more than 3 times week." Data were based on the Adolescent(More)
Juhani Keinonen for the facilities for working. I want also to thank my supervisor Prof. Markku Kulmala for his cooperation and guidance during this work. I'm really glad that I have been able to do things in compliance with my own ideas. In the current profit striven world it is not axiomatic, even at the university. I also appreciate the work carried out(More)
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