Figures & data
TABLE 1 Measured PM2.5, organic carbon, elemental carbon, and elemental mass concentrations at each of the four sites
FIG. 1 (a) Locations of sampling sites within the Greater Cincinnati Airshed. (b) Photograph of the Findlay sampling area in relation to the major interstate highway I-75.
FIG. 2 (a) Ten-minute and 24 h average mass concentrations at Findlay, measured by TEOM and HIs, as well as wind direction for the same days. The two solid lines in the wind direction figure indicate the time when the wind was directed from the highway to the sampling location: — •• —, HI Teflon; — — —, HI quartz; ‐ ‐ ‐ ‐ ‐, 24 h TEOM average; — —, 10 min TEOM average. (b) Ten-minute and 24 h average mass concentrations at Mernic, measured by TEOM and Impactors, as well as wind direction for the same days: — •• —, HI Teflon; — — —, HI quartz; ‐ ‐ ‐ ‐ ‐, 24 h TEOM average; — —, 10 min TEOM average.
TABLE 2 Twenty-four hour average PM2.5 concentrations (in μ g/m3) measured at three sites in Cincinnati
FIG. 3 Ratio of PM2.5 measured by the HI (Teflon and quartz) and TEOM as a function of OC levels at all sites.
FIG. 4 Automobile and heavy-duty truck traffic density and average mass concentrations (TEOM), versus time, at the Findlay sampling site (25 and 26 July 2002). The two solid lines in the wind direction figure indicate the time when wind was directed from the highway to the sampling location.
TABLE 3 Shape distributions of collected aerosols and average Df values of aggregates
FIG. 5 SEM images of aggregates collected at the four sites. Also listed are the average 2D fractal dimensions.
FIG. 6 PM2.5 (TEOM) and number concentrations (CPC) measured at the Blue Ash site on 24 July 2002. Error bars represent one standard deviation. Sampling durations vary between 90 and 200 min.
FIG. 7 (a) Size distributions measured with the DMA at Mernic on 31 July 2002. (b) Electron micrograph of numerous small spheres collected at the Mernic site.
