The uncontrolled urbanization and industrial development have caused serious environmental effects in the form of contamination. Air, water, and soil have been contaminated for a long due to ineffective pollution control. Environmental pollution is a major issue that needs immediate attention and effective solutions. NanomaterialsNanomaterials (NMs) have been applied for pollution remediation technology due to their promising and unique properties. The nanoremediation process includes using engineered materials to clean up the contaminated environment. Various metal, metal–oxide, and composite nanomaterials perform well in the remediation process due to their huge surface area, large surface-to-volume ratio, and number of reactive sites. Recently, carbon nanomaterials have caught the attention of many researchers for their application in remediation technology. Carbon nanomaterials are made up of pure carbon which gives them higher stability, possess low toxicity, and are environmentally friendly. They show extraordinary mechanical properties, and flexible structure and are lightweight making a perfect candidate for remediation applications. This chapter highlights how carbon nanomaterials with their different forms and useful properties perform in the remediation process of air, water, and soil. The functionalization of the surface of carbon nanomaterials helps to remediate organic and non-organic pollutants and heavy metals from the environment. Major attention should be given to making the availability or production of these nanomaterials at a cheaper price to increase their use in nanoremediation technologies. The challenges and prospects of carbon nanomaterials in remediation technologies have been discussed.