Nowadays it is well recognized that the transport of chemical species through the planetary boubdary layer of the atmosphere is a key of global change problem and needs more reliable parametrization (Wyngaard, 1990) and the study of formation and destruction of photochemical smog is expanding at both small and large scale (Wanner, et al.; 1993). Also in the air pollution modeling, the usual parctice of neglecting the concentration correlation in atmospheric photochemical reaction has recently been recognized as a source of serious error and it is shown that in the case of pure mixing (without chemical reaction) the concentration (of air pollution) decays with time in a natural manner but if the concentration selected is that of chemical reactant, then the effect is that the dispersion of the concentration (of air pollution) is much more rapid (Kumar and Patel 1974, 1975); Patel 1974, 1976, 1983, 1984, 1985, 1998). The practical applications of concentrations chemical flow occur whenever the process of turbulent flow and chemical reaction are merge, particularty when the reactant species are nonuniformly distributed. The urban air pollution is an interesting case of this problem because the pollutants are introduced in the atmosphere at various locations so that large concentration inhomogeneities exist before the pollutants are brought togather by moviments and mixing large scale masses by atmospheric turbulent winds. This is common in the case of auto exhausts when the pollutants are discharged and subsequently mixed and react in the atmosphere. So, it is important to study the various aspects of the concentration flctuations (of air pollution) with photochemical reaction. A model of the transport of air pollution with photochemical reaction has been devloped using the appropriate closur model. This study, also shows that, in the case of pure mixing , the concentration decays in a natural manner, but if the concentration selected is that of photochemical reactant, then the effect is that the transport of air pollution in planetary boundary layer is much more rapid.