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Quantifying PM2.5 from long-range transport and local pollution in Taiwan during winter monsoon: An efficient
Ming-Tung Chuang1, Chung-Te Lee2, Hui-Chun Hsu2
1Graduate Institute of Energy Engineering, National Central University, Taoyuan, 32001, Taiwan.
Journal of Environmental Management
|September 2, 2018
Summary
Annually, the northeast monsoon transports PM2.5 from Asia. This study developed a method to distinguish long-range transport PM2.5 (LRT-PM2.5) from local pollution PM2.5 (LP-PM2.5) in Taiwan.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Air Quality Monitoring
Background:
- The northeast monsoon annually transports PM2.5 (particles less than 2.5 μm in aerodynamic diameter) from the Asian continent to downstream regions.
- Understanding the contributions of long-range transport PM2.5 (LRT-PM2.5) versus local pollution PM2.5 (LP-PM2.5) is crucial for air quality management.
Purpose of the Study:
- To develop an economical and efficient method for estimating the contributions of LRT-PM2.5 and LP-PM2.5.
- To analyze the spatial and temporal variations of LRT-PM2.5 and LP-PM2.5 in Taiwan.
Main Methods:
- Utilized PM2.5 and meteorological observation data from Taiwan (2006-2015).
- Employed a short-term simulation (January-May 2010).
- Classified PM2.5 into three source patterns: LRT-Event, LRT-Ordinary, and LRT/LP Mix or Pure LP.
Main Results:
- Average LRT-PM2.5 concentrations varied across patterns: LRT-Event (31-39 μg/m³), LRT-Ordinary (12-16 μg/m³), and LRT/LP Mix or Pure LP (4-13 μg/m³).
- Regional contributions showed distinct patterns: Northern Taiwan had higher LRT-PM2.5 contributions, while Southern Taiwan had higher LP-PM2.5 contributions.
- LRT-PM2.5 peaked in 2013 and decreased thereafter; LP-PM2.5 showed a general decreasing trend over the decade.
Conclusions:
- The developed method effectively differentiates LRT-PM2.5 and LP-PM2.5 contributions.
- Significant regional disparities in PM2.5 sources exist in Taiwan.
- Both LRT-PM2.5 and LP-PM2.5 have shown decreasing trends in recent years, with LRT-PM2.5 peaking in 2013.
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