Ultraviolet radation within 100 and 280 nm. Almost all of UV-C light from the natural solar light is filtred out in the atmosphere.
Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.