2023
DOI: 10.1029/2023jd039875
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Molecular and Elemental Tracers‐Based Receptor Modeling of PM2.5 in Suburban Hong Kong With Hourly Time‐Scale Air Quality Considerations

Shan Wang,
Qiongqiong Wang,
Yuk Ying Cheng
et al.

Abstract: Continuing control efforts in recent decade have notably brought down fine‐particulate‐matter (PM2.5) pollution to compliance with the annual average air quality objective in Hong Kong. However, short‐term (several hours to few days) PM2.5 pollution sporadically occurred in winter and has become a major focus of attention, calling research in characterizing sources and their variations at hourly timescale. This study reports hourly measurements of PM2.5 and its chemical speciation, including molecular and elem… Show more

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Cited by 2 publications
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“…Corresponding to the increase in metal tracers during firework displays, a significant rise in the RPA of chlorine was observed, accompanied by a synchronous and noteworthy increase in the EC mass concentration and the EC/PM 2.5 mass ratio (Figure a). Charcoal is the main ingredient in fireworks, and potassium perchlorate (KClO 4 ) or potassium chlorate (KClO 3 ) primarily serve as the oxidizers in fireworks, releasing O 2 and leaving behind KCl through thermal decomposition. Similar concentration spikes of these chemical components have also been widely documented in other firework events. ,, …”
Section: Resultsmentioning
confidence: 85%
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“…Corresponding to the increase in metal tracers during firework displays, a significant rise in the RPA of chlorine was observed, accompanied by a synchronous and noteworthy increase in the EC mass concentration and the EC/PM 2.5 mass ratio (Figure a). Charcoal is the main ingredient in fireworks, and potassium perchlorate (KClO 4 ) or potassium chlorate (KClO 3 ) primarily serve as the oxidizers in fireworks, releasing O 2 and leaving behind KCl through thermal decomposition. Similar concentration spikes of these chemical components have also been widely documented in other firework events. ,, …”
Section: Resultsmentioning
confidence: 85%
“…43−45 Similar concentration spikes of these chemical components have also been widely documented in other firework events. 13,14,42 The increased abundance of the aforementioned species associated with fireworks, coupled with a decrease in the RPAs of nitrate and ammonium, as well as a reduction in the OC/EC mass ratio (mean: 2.33; minimum: 0.96) during firework displays, provided compelling evidence that direct emissions from fireworks significantly contributed to the elevated PM 2.5 levels observed on NYE, NYDN, and LFN. The atmospheric particles observed during firework displays, which comprised emissions from fireworks and local sources such as residential coal combustion, vehicle exhaust, road dust, and cooking emissions, exhibited an enrichment in organic compounds, EC, inorganic ions, and metals (Figure S9).…”
Section: Severely Persistent Pollution Events During the Sfmentioning
confidence: 99%
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