Annele Virtanen

TL;DR: In this paper, the influence of traffic on urban air quality is highest at low wind speeds and the presence of a temperature inversion, and it is shown that under suitable meteorological conditions (low wind speeds coupled with temperature inversions), traffic emissions are able to affect submicron particle number concentrations over large areas around major roads and may be a dominant source of ultrafine particles in the urban atmosphere.

TL;DR: In this paper, the phase state of atmospheric aerosols has an impact on their chemical aging and their deliquescence and thus their ability to act as cloud condensation nuclei (CCN).

TL;DR: In this article, the formation of new atmospheric particles involves an initial step forming stable clusters less than a nanometre in size ( ~10 nm) Although at times, the same species can be responsible for both processes, it is thought that more generally each step comprises differing chemical contributors.

TL;DR: The effects of the fuel injection pressure on a heavy-duty diesel engine exhaust particle emissions were studied and the core mode emission and also the size of the mode increased with increasing NOx emission while the soot mode size and emission decreased simultaneously.

TL;DR: The principal findings are the following: (1) The temperature of the particle size instruments, test cell versus room temperature, has little effect on the measurements; (2) Once the engine has warmed, solid particle (soot) mode emissions in the cold test cell are similar to those at room temperature.