Particle dispersion is an important research area as this provides insight into how a particle behaves, how long the particle will fall, how far the particle will travel away from the source, and its concentration at a particular time and point of location. In this review paper, different models used to study the dispersion of particulate matter are explained and compared. The mechanism and factors that affect the dispersion of particles are discussed. Applications of the atmospheric dispersion model are also given. Moreover, the topics sufficiently lacking in the literature and insight into further areas that should be improved are discussed.