1. Air Pollution Dispersion Lab
Tim Ellis, Ph.D., P.E.
CE 326 Principles of Environmental Engineering
Department of Civil, Construction and Environmental Engineering
Iowa State University
Spring 2008

2. ATMOSPHERIC CONDITIONS WHICH AFFECT AIR POLLUTION
Wind direction and speed
Cloud cover radiation reaching earth temperature profile turbulence
Precipitation

3. Neutral Stability

4. Unstable

5. Stable

6. Inversion in Los Angeles, CA

7. Inversion at Four Corners power plant

8. Fig 7-17: Land Breeze during night

9. Fig 7-18: Land Breeze during day

10. Fig 7-19: Effect of lake breeze on plume dispersion

11. Fig 7-21: Plume dispersion coordinate system

13. Fig 7-22: Horizontal dispersion coefficient

14. Fig 7-23: Vertical dispersion coefficient

18. PLUME RISE

19. Fig 7-24: Effect of elevated inversion on dsipersion

20. sz = 0.47 ( L - H )

25. Building Downwash

26. Building Downwash

27. Building Downwash

28. Building Downwash