Figure 4.
BTEX and NOx (ppbv) isopleth contour maps derived from passive diffusive sampling data for February 7–10, 2012.
Contour maps are constructed from 72 hour averaged measurements at ∼50 diffusive sampling sites. Site locations are indicated by pink rectangles. Figures 4a–4e show maps for 5 individual BTEX species as labeled. Figure 4f shows the contour map for NOx. Note the different color-coded mixing ratio scales for each pollutant. Wells are superimposed to aid as geographic markers.
