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“Urban air quality” is a wide subject with different social, economic, and health aspects in different parts of the world locally and regionally. Cities, representing the urban regions, are the concentrations of human and activities where the highest levels of air pollution is found as the largest target of environmental and health impacts.
 
Currently we have the following research interest in urban aerosols:
- Data analysis and modeling
- Emissions, formation, and transformation processes
- Road dust suspension and re-suspension
- Modal structure
- Meteorological dependence of the size distribution
- Temporal and spatial variations
  
Hussein and Kulmala (2008): "The type and amount of indoor air pollutants affect the comfort and quality of indoor environments. Therefore, indoor air quality is an important issue with different social, economic, and health aspects because people in developing countries spend most of their time indoors being exposed to different kinds of indoor pollutants. The indoor air quality can be assessed empirically by measuring the pollutant concentrations or can be predicted by means of mathematical models. An indoor aerosol model describes the dynamic behavior of indoor air pollutants. The basic concept of indoor air models is the mass-balance-conservation where several factors that govern the indoor particle concentrations can be described. These factors may
include direct emissions from indoor sources, outdoor aerosol particles penetrating indoors as a result of the ventilation and filtration processes, deposition onto indoor surfaces, and removal from indoor air by means of ventilation."