The dispersion modelling in tow wind speeds assumes importance because of the high frequency
of occurrence and episodic nature of these poor diffusion conditions. A steady-state athematical model has been proposed for the dispersion of air pollutants in low winds by taking into account the diffusion in the three coordinate directions and advection along the mean wind. The apparent eddy diffusivities have
been parameterized in terms of downwind distance for near-source dispersion (Arya, 1995, J. appL Met. 3,1, 1112 1122), The constants involved in the parameterization are essentially the squares of intensities of turbulence. An analytical solution for the resulting advection diffusion equation with the physically relevant boundary conditions has been obtained. The solution has been used to simulate the tield tracer data collected at lIT Delhi in low wind convective conditions. Various particular cases of the present study have been discussed and the results have been compared with the Gaussian plume solution and Arya's fi995, J. appl. Met. 34, 1112 1122) solution.