1. Limonene 5ppb, Isoprene 120ppb O3 20ppb 25.09.2009

2. The number background is increasing slowly, it was 30p/cc yesterday!.. There are no spikes in NOx though!!

3. One possibility is that the valve does not fully turn to the fill position and allows for some return particles: the final fill had a bigger spike and the valve needed some assistance to fully turn

4. 17min ALO

5. 27min ALO (18k p/cc, 120ppb Isoprene) 22k p/cc 60ppb Isoprene, 42k p/cc zero Isoprene

6. 35min ALO (champDMPS mass 1.8ug/m3, mode 48nm)

7. 1h ALO

8. 4h ALO

9. No spikes in post exp!!

10. Number overview