Plastic waste is the most prevalent type of pollution in the Pacific Ocean, contributing to significant environmental harm.

Plastic waste, particularly in the form of microplastics, is a major source of pollution in the Pacific Ocean. The ocean is heavily affected by plastic debris from land-based sources, including plastic bottles, bags, and packaging materials, which often end up in the water. These plastics pose serious threats to marine life, as animals can ingest or become entangled in plastic debris. Additionally, plastic waste can break down into smaller particles, which persist in the environment for hundreds of years, further impacting the ocean's ecosystems. While oil spills and heavy metals are also serious pollutants, plastic waste remains the most widespread and persistent problem in the Pacific.