7000 6000 Prevailing temperature g5000 4000 Stable 3000 Unstable 2000 stable 1000 0 20 0 20 40 Air temperature('C Figure 9.2 Some possible temperature profiles in the lower atmosphere. The region to the left of the adiabatic lapse rate is unstable and will lead to appreciable vertical mixing of polluted air released near the ground. The region to the right represents stable conditions and air stagnationFigure 9.2 Some possible temperature profiles in the lower atmosphere. The region to the left of the adiabatic lapse rate is unstable and will lead to appreciable vertical mixing of polluted air released near the ground. The region to the right represents stable conditions and air stagnation