Field Validation of a Public Health Particulate Matter (PHPM) Low-Cost PM_2.5 Monitor and Commercial Sensors with Light Scattering Technology

Figure 5

Observed PM_2.5 concentrations, as measured by the SI device, on the -axis compared to the estimate of PM_2.5 from the PHPM device, as measured at (a) a controlled indoor environment with incense (chamber); (b) the Khon Kaen University campus (University Campus); (c) in downtown Khon Kaen (urban center); and (d) at rural area near a sugar cane factory (rural industrial).

(a)

(b)

(c)

(d)