Factors affecting multiple persistent organic pollutant concentrations in the air above Japan: A panel data analysis

Area of Science:

• Environmental Chemistry
• Atmospheric Science
• Statistical Analysis

Background:

• Temporal trends of atmospheric persistent organic pollutants (POPs) are widely studied using various statistical methods.
• The specific link between industrial activities and atmospheric POP concentrations in Japan remains underexplored.

Purpose of the Study:

• To investigate the correlation between industrial activity and atmospheric POP concentrations in Japan.
• To analyze temporal trends of specific POPs (PCBs, PCNs, PBDEs, HCB, PeCBz) over a 16-year period.

Main Methods:

• Utilized a 16-year (2003-2018) atmospheric monitoring dataset from 53 sites across Japan.
• Employed panel data analysis to assess the influence of various factors, including industrial activity, population, and meteorological variables, on POP concentrations.
• Focused on analyzing concentrations of PCBs, PCNs, PBDEs, HCB, and PeCBz.

Main Results:

• Atmospheric concentrations of PCBs, PCNs, and PBDEs were significantly influenced by industrial activity (waste incinerators, cement kilns, steel industry, zinc production), year, population, temperature, and atmospheric boundary layer.
• Industrial activity showed a stronger positive correlation with PCBs, PCNs, and PBDEs compared to population.
• Significant decreasing trends were observed for atmospheric ∑PBDEs, ∑PCNs, and ∑PCBs, with estimated half-lives.
• HCB and PeCBz concentrations showed steady or slightly increasing trends and were not significantly affected by the analyzed industrial factors.

Conclusions:

• Panel data analysis is effective for assessing national-scale spatial and temporal POP trends and understanding pollutant responses to environmental variables.
• Industrial activities are a significant driver for atmospheric PCB, PCN, and PBDE concentrations in Japan.
• While some POPs are decreasing, others like HCB and PeCBz require continued monitoring.