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Evaluating long-term reductions in trace metal emissions from shipping in Shanghai

  • 0Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Journal of Hazardous Materials +

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November 8, 2024

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November 8, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

China

Area Of Science

  • Environmental Science
  • Atmospheric Chemistry
  • Air Pollution Monitoring

Background

  • Shipping emissions significantly contribute to air pollution in coastal urban areas.
  • Shanghai Port, a global hub, faces substantial environmental challenges from maritime traffic.
  • China implemented Domestic Emission Control Area (DECA) policies (1.0 in 2016, 2.0 in 2019) to curb shipping emissions.

Purpose Of The Study

  • To assess the impact of China's DECA policies on shipping emissions using long-term measurements.
  • To quantify the reduction in specific emission tracers (vanadium and nickel) after policy implementation.
  • To validate emission reduction estimates using meteorological data and air quality modeling.

Main Methods

  • Conducted long-term online measurements of vanadium (V) and nickel (Ni) at the Dian Shan Lake supersite.
  • Analyzed V concentration trends in relation to wind direction and seasonal variations.
  • Applied Random Forest (RF) and Community Multiscale Air Quality (CMAQ 5.4) models to account for meteorological influences.

Main Results

  • Observed a significant decrease in V concentrations from 7.08 ng m⁻³ (DECA 1.0) to 2.64 ng m⁻³ (DECA 2.0), a 63% reduction.
  • Modeled results confirmed up to an 82% reduction in V concentrations, particularly during periods with marine winds.
  • Identified that nickel (Ni) has additional emission sources beyond shipping requiring further management.

Conclusions

  • China's DECA policies have demonstrably improved regional air quality by reducing shipping emissions.
  • Long-term monitoring is crucial for evaluating the effectiveness of environmental policies on emission patterns.
  • Further emission control strategies are needed for pollutants like nickel that have diverse sources.

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