Pasi Miettinen

TL;DR: It is shown that organic vapours alone can drive nucleation, and a particle growth model is presented that quantitatively reproduces the measurements and implements a parameterization of the first steps of growth in a global aerosol model that can change substantially in response to concentrations of atmospheric cloud concentration nuclei.

TL;DR: In this article, the authors build a global model of aerosol formation using extensive laboratory-measured nucleation rates involving sulfuric acid, ammonia, ions and organic compounds, and a comparison with atmospheric observations show that nearly all nucleation throughout the present-day atmosphere involves ammonia or biogenic organic compounds.

TL;DR: The results do not indicate a serious threat to the developing brain from mobile phone radiation at intensities relevant to human exposure, and the interesting finding of improved learning and memory warrants further studies.

TL;DR: In this article, the first laboratory experiments of aerosol formation from oxidation of volatile organic species emitted by living plants were presented, and the results indicated that if oxidized organics are involved in atmospheric nucleation events, their role is to participate in the growth of pre-existing molecular clusters rather than to form such clusters through homogeneous or ion-induced nucleation.

TL;DR: In this article, an Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) was deployed in Hyytiala, a forested rural measurement site in southern Finland, during a 2-week measurement campaign in spring 2005.