Table B4. PICO-NARE instrumentation Species/Parameter Reference Technique Averaging Time Accuracy (2-sigma) Precision (2-sigma) Detection Limit Measurement Period NO Ryerson et al. [1999] and Val Martin et al. [2006] NO/O3 chemiluminescence 30 s 4% + 1.5 pptv 8 pptv 5 to 6 pptv (1-hour average) 2002-2005 NO2 Ryerson et al. [1999] and Val Martin et al. [2006] photolysis-chemiluminescence 30 s 4% + 4 pptv 17 pptv 11 to 13 pptv (1-hour average) 2002-2005 NOy Ryerson et al. [1999] and Val Martin et al. [2006] Au converter-chemiluminescence 20 s +8/­15% + 2 pptv 11 pptv 7 to 9 pptv (1-hour average) 2002-2005 O3 Ryerson et al. [1998], Honrath et al. [2004], and Owen et al. [2006] ultraviolet absorption 60 s 3% <1 ppbv 1 ppbv 2001-2005 CO Honrath et al. [2004] and Owen et al. [2006] nondispersive infrared absorption 30 min 7% 4 to 9 ppbv 2 ppbv 2001-2005 Equivalent black carbon Fialho et al. [2005] multiwavelength aethalometer 1 hour not characterized 25 ng/m3 25 ng/m3 2001-2005 NMHCs (C2-C6) Tanner et al. [2006] continuous GC 12 min and 60 min 5-10% 5-10% <10 pptv 2004-2005