Improved Measurement of Seasonal and Diurnal Differences in the Carbonaceous Components of Urban Particulate Matter Using a Denuder-Based Air Sampler

Figures & data

FIG. 1 Comparison of average daytime OC fractions determined by the IOGAPS and FP. IOGAPS-OCQ is the sum of OC1 to OC4 and PC determined from the IOGAPS quartz filter. IOGAPS-OC is the sum of IOGAPS-OCQ and IOGAPS-SVOC. (a) Summer daytime (16–21 July 2001), (b) Winter daytime (17–24 March 2003).

FIG. 2 Comparison of average nighttime OC fractions determined by the IOGAPS and FP. (a) Summer nighttime (16–21 July 2001), (b) Winter nighttime (17–24 March 2003).

FIG. 3 The OC on the IOGAPS quartz filter (IOGAPS-OCQ) and the SVOC captured by the backup SIFs (IOGAPS-SVOC) determined by the IOGAPS. Also shown is the OC determined by the FP sampler (FP-OC).

FIG. 4 Comparison of particulate OC determined by the IOGAPS and FP. Shown also is PM_2.5 mass (μ g/m³) determined by a Partisol sampler on a daily basis.