Polystyrene (PS), a widely used synthetic aromatic polymer, is integral to industries such as packaging, construction, and medical equipment. Its high molecular weight and economic advantages make it versatile, yet limitations like low oxygen barrier properties, vulnerability to smog, and a low melting point pose challenges. General Purpose PS (GPPS), Expanded PS (EPS), High Impact PS, (HIPS), and Syndiotactic PS (SPS) are some of the industrial important variants. This Study explores the synthesis, properties, production processes, and diverse applications of PS while addressing its disposal challenges and opportunities for improved reusability. Innovative approaches have transformed Waste PS (WPS) into valuable materials like ion exchangers, lightweight concrete, paints, and composites, enhancing environmental and economic value chains. A notable breakthrough is the use of WPS in chemiluminescent systems, where its photonic properties improve reaction sensitivity and diagnostic efficiency, achieving dual benefits of waste reduction and scientific advancement. Recycling WPS offers significant environmental benefits, reducing reliance on harmful disposal methods such as landfilling and incineration, thereby lowering pollution and greenhouse gas emissions. Advanced recycling technologies, including microwave-assisted pyrolysis and reverse polymerization, have improved efficiency and product recovery, unlocking the economic potential of WPS recycling. This aligns with Sustainable Development Goals 12 (Responsible Consumption and Production) and 13 (Climate Action). In a nutshell, the study encourages collaboration among researchers, policymakers, and industry stakeholders to establish robust policies, incentivize proper PS disposal and recycling, and promote innovations that enhance sustainability while mitigating environmental impacts. Graphical Abstract