Nanotechnology plays a vital role in environmental monitoring and remediation by enabling the detection and removal of pollutants with high precision and efficiency. Nanosensors, often composed of materials like carbon nanotubes or metal nanoparticles, can detect trace levels of environmental contaminants such as heavy metals, pesticides, and gases in air, water, and soil. These technologies offer faster, more cost-effective, and scalable solutions compared to traditional methods, making nanotechnology a powerful tool for advancing environmental protection and sustainability.