1. Carbon Meeting Joann Rice Sacramento, CA January 22-23, 2008

2. “Old” CSN  MetOne SASS sampler 6.7 LPM flow rate with active flow control 46.2-mm QMA Quartz filter  CSN TOT analysis by RTI OC in He (900C); EC in He/O2 (920C) “New” CSN  URG3000N sampler (IMPROVE-like) 22 LPM flow rate with active flow control 25-mm Pallflex Quartz filter  IMPROVE_A TOR analysis by DRI OC in He (580C); EC in He/O2 (840C) SOPs posted at http://www.epa.gov/ttn/amtic/specsop.html “Old” versus “New” CSN Carbon

3. Two months (May-June 2007) of collocated old and new CSN at all Phase 1 sites  Collocation was resource restricted  For purposes of overlap only to minimize data loss  About 10-20 collocated observations per site No artifact adjustments made to either old or new CSN data No data screening for MDL or other outliers “Old” versus “New” CSN Carbon First Look

4. “Old” versus “New” CSN OC

6. “Old” versus “New” CSN EC

8. Collocated “Old” CSN OC

9. Collocated “Old” CSN EC