Heléne Österlund’s main scientific interests are related to stormwater and snow quality and includes the sources to the pollutants present in stormwater and snow. The research involves field sampling of stormwater and snow in urban catchments but also includes laboratory experiments. The studies aim to characterise various impervious surfaces commonly found in the urban environment and which may leach pollutants to the environment via stormwater runoff, characterise in which chemical forms the pollutants are transported in stormwater as well as pollutant pathways in snow and snowmelt. The pollutants in focus have been metals and organic micro pollutants. During recent years, the studies have been extended to also include micro plastics and litter.