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Nanotechnology is a promising field of interdisciplinary research. The potential uses and benefits of nanotechnology are enormous. Nanotechnology is the technology of 21st century i.e. Nanotechnology is the science of the extremely small particles holds enormous potential applications for environment. Nanotechnology is the science of materials at the molecular or subatomic level. It involves engineering of particles smaller than 100 nanometers (one nanometer is one-billionth of a meter) and the technology involves developing materials or devices within that size is invisible to the human eye and often many hundred times thinner than the width of human hair. The physics and chemistry of materials are radically different when reduced to the nanoscale; they have different strengths, conductivity and reactivity, physical, chemical, biological, thermal, electrical properties. Nanotechnology has been described as the development of clean technologies, to minimize potential environmental and human health risks associated with the manufacture and use of nanotechnology products and to encourage replacement of existing products with new nano-products that are more environmentally friendly throughout their lifecycle. Most applications of Nanoparticles in reducing natural disasters can be analyzed in three main areas that are building materials, sensors and medicine.