1. Construction of the new UNC dual Aerosol chamber Constructed in 2002 and took about 1 year to complete The dual chamber is Quonset hut in design, width = 8.53 m length = 9.75 m height = 3.89 m The total chamber volume is ~270m 3

2. The walls of the chamber are made of 5 mil FEP Teflon film and are attached on 1.22 m centers to 4.81 cm o.d. round tubular metal frames that form the superstructure of the chamber.

3. A suspended 5 mil FEP Teflon film (type C) curtain, (Livingstone Plastics, Charlotte, NC) bisects the chamber to form two chamber halves.

4. Building a platform

5. Building the frame

6. The small superstructure frame creates very little shadowing of the sunlight entering the chamber and also provides a very durable structure.

7. Orientation to the sun is very important

8. Frame attachment to platform

9. Sealing the joints

10. Bracing

11. Floor

12. Intake ducts

13. Mixing Fans 13

14. Entry door

15. Exhaust port

16. Attaching Film

18. Finished

19. Three UNC chambers

20. Injection of liquids

21. Sampling directly under chamber

22. GAS phase NO-O 3 titration

23. Auto sampling GCs for VOC analysis