The following information was recorded on August 12, 2011 at 10p.m.:
- Wind Speed at 75m = 10.8 m/s
- Wind Direction at 75 m = 120 o
- Sigma Theta at 75 m = 9.2 o
- Atmospheric Temperature = 21.2 oC
- Stack Exit Temperature = 200 oC
- Stack Height = 75 m
- Stack Diameter = 0.2 m
- Stack Exit Velocity = 10.2 m/s
- Source Strength = 100 g/s
- Air Contaminant = VOC
Plot C u/Q versus downwind distance under night-timeconditions and compare your results with calculations usingday-time conditions. Use sigmas from Problem 4. Choose the one ofthe following statement using your results:
| | In general, night-time concentrations are the same as day-timeconditions. |
| | In general, day-time concentrations are higher than thenight-time concentrations. |
| | In general, night-time concentrations are higher than theday-time concentrations. |
| | None of the above. |
