This document discusses different types of plume patterns that can occur based on environmental conditions near the ground. It describes looping, neutral, conning, fanning, and lofting plumes that are characterized by the relative positions of the environmental lapse rate and adiabatic lapse rate lines. The document also discusses methods to enhance smokestack dispersion, including making the smokestack taller to allow pollution to dilute over a longer distance before reaching the ground, increasing the exit velocity by narrowing the smokestack opening, and increasing the exit temperature for greater positive buoyancy.