Monitoring New Pollutants in Shenzhen Bay Estuary

By XIAO DAI on Aug 13, 2025

Introduction

Shenzhen Bay, a 3.8 km² estuary in southern China, faces pollution challenges due to rapid urbanization and storms. The Shenzhen Bay Estuary New Pollutant Monitoring Program targets polycyclic aromatic hydrocarbons (PAHs), toxic compounds released from sediments post-storm, to protect this vital ecosystem.

The Issue: Storm-Driven PAH Release

Storms disrupt Shenzhen Bay’s sediments, releasing PAHs—persistent, toxic pollutants from combustion—into the water. This endogenous release spikes PAH levels, threatening marine life and spreading contaminants to the ocean.

The Solution: Rapid Monitoring

The monitoring program rapidly assesses PAH distribution after storms, using water and sediment samples to identify high-risk hotspots. This enables targeted interventions to mitigate ecological damage.

Findings: PAH Surge Post-Storm

Post-storm, PAH concentrations in parts of the estuary surged up to 12.7 times baseline levels, highlighting significant pollutant release and the need for urgent action.

Why It Matters

This initiative protects Shenzhen Bay’s ecosystem, supports sustainable fisheries, and informs pollution control policies. It serves as a model for coastal regions facing similar climate-driven challenges.

Conclusion

The Shenzhen Bay monitoring program addresses storm-driven PAH pollution, safeguarding a critical ecosystem. Its success underscores the importance of proactive environmental monitoring for sustainable coastal management.