Soiling losses refer to loss in power resulting from snow, dirt, dust and other particles that cover the surface of the PV module.
Dust is generated from many sources such as pollution by wind, pedestrian volcanic eruptions, and vehicular movements among many others.
The accumulated dust over time aggravates the soiling effect. In fact, the amount of accumulated dust on the surface of the PV module affects the overall energy delivered from the PV module on a daily, monthly, seasonal and annual basis.