Abstract:
Objective To investigate the transport pathways and potential source areas of atmospheric PM2.5 during the heating and non-heating periods in Yangquan city, Shanxi province.
Methods Hourly PM2.5 monitoring data and global data assimilation system data were collected from January 1 to December 31, 2024. Backward trajectory clustering analysis, potential source contribution function analysis and concentration weighted trajectory analysis were applied to explore transportation paths and potential source regions of atmospheric PM2.5 pollution.
Results The M (P25, P75) of atmospheric PM2.5 throughout the year was 33.3 (19.9, 52.2) μg/m3. The concentration during the heating period was higher than that during the non-heating period. During the heating period, air mass transport in the study area was predominantly from the northwest, with the long-distance cross-border transport pollution from Mongolia contributing the most, and the central and eastern parts of Henan province were the most core potential source contribution areas. During the non-heating period, air masses from the northeast accounted for the highest proportion, while the central part of Anhui Province had the highest weighted concentration weighted trajectory(WCWT) value of 45.0-50.0 μg/m3.
Conclusion The transport sources and potential source areas of atmospheric PM2.5 in Yangquan city differ between the heating and non-heating periods. Precise prevention and control measures should be implemented targeting the dominant pollution sources in different seasons.
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