气候变化领域集成服务门户(CCPortal): The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments

CCPortal

DOI	10.1016/j.atmosres.2020.105039
	The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments
	Gali N.K.; Stevanovic S.; Brimblecombe P.; Brown R.A.; Ristovski Z.; Ning Z.
发表日期	2020
ISSN	0169-8095
卷号	244
英文摘要	The airborne particulate matter (PM) is known to cause adverse pulmonary and cardiovascular health effects. This study investigated the diurnal characteristics of PM induced PM-bound ROS from real time measurements in typical roadside and urban background sites in Hong Kong, and identified potential influencing factors to its variation in atmosphere. A nitroxide probe (BPEAnit) was employed in the real-time measurement of separate PM and gas phase induced reactive oxygen species (ROS) with a Particle-into-Liquid-Sampler. Measurements were carried in 2 h intervals over a 24 h period, and repeated for 6 days at each site. The total ROS (particle + gas phase) measurements resulted in multiple peaks at 08:00, 16:00 and 20:00 h time periods at background site, compared to non-intermittent decrease/increase trends at roadside. The total ROS generation was noted significantly higher by 50–100% (n = 6 p < .05) at roadside compared to the background site. While the contribution of PM2.5- and gas phase-induced ROS to the total ROS was on average 48 ± 8% and 52 ± 8% across 24 h at background site, the ratio of gas phase-induced ROS increased to 79 ± 4% and that of particle phase decreased to 21 ± 4% at roadside site. The total ROS well correlated with black carbon (BC) and particle-bound PAHs (p-PAHs), which are 4–8 fold and 10–20 fold higher at roadside than background. The ratio of p-PAHs/BC was high at roadside during peak hours compared to late nights suggesting fresh PM may have induced more total ROS generation compared to aged aerosols using this specific ROS probe. © 2020 Elsevier B.V.
关键词	Gases Particulate emissions Probes Roadsides Time measurement Airborne particulate matters Health effects Multiple-peak Particle phase Real time measurements Roadside environments Ros generations Urban background Urban growth black carbon diurnal variation measurement method particulate matter reactive oxygen species real time roadside environment urban atmosphere China Hong Kong
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132413
推荐引用方式 GB/T 7714	Gali N.K.,Stevanovic S.,Brimblecombe P.,et al. The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments[J]. Atmospheric Research,2020,244.
APA	Gali N.K.,Stevanovic S.,Brimblecombe P.,Brown R.A.,Ristovski Z.,&Ning Z..(2020).The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments.,244.
MLA	Gali N.K.,et al."The diurnal characteristics of PM-bound ROS and its influencing factors at urban ambient and roadside environments".244(2020).