Navajo Coal Combustion and Respiratory Health Near Shiprock, New Mexico
Figure 3
Ratio of indoor to outdoor trace element concentrations associated with PM2.5 at the two sites, 78 and 151, during winter 2006 when coal was burned indoors for heat. Elements falling above the 1 1 ratio line (in red) were detected at higher concentrations indoors relative to outdoors, while those falling between zero and one were detected at lower concentrations indoors relative to outdoors.
