『Abstract
　The type and amount of indoor air pollutants affects 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. Here we present principles of indoor aerosol models and we also give examples of different kind of models.

Keywords: Indoor air quality; Emissions; Numerical simulation』

1. Introduction
2. Mathematical formulation
　2.1. Indoor-outdoor air exchange, filtration, and infiltration processes
　2.2. Internal air exchange processes
　2.3. Deposition and resuspension processes
　2.4. Other aerosol dynamic processes: Condensation/evaporation, coagulation, nucleation
　2.5. Indoor sources of aerosol particles
3. Mathematical solutions of indoor aerosol models: Some practical applications
　3.1. Numerical simulations
4. Summary and conclusions
References