variavel0=<b>Maxsuel Marcos Rocha Pereira</b> - maxsuel@model.iag.usp.br Universidade de São Paulo
<b>Amauri Pereira de Oliveira</b> - apdolive@usp.br Universidade de São Paulo
<b>Edson Pereira Marques Filho</b> - emarques@model.iag.usp.br Universidade de São Paulo
<b>Hugo Abi Karam</b> - hakaram@model.iag.usp.br Universidade de São Paulo
<b>Abstract.</b> In this work, is presented a revision of the main theoretical features of the most used lagrangian particle models in describing the pollutant dispersion process in the atmosphere, under  homogeneous, non-homogeneous, non-stationary, gaussian and non-gaussian turbulence conditions, over areas of complex topography.
<b>Keywords.</b> Langevin equation, Well-mixed condition, Lagrangian particle model.