Seoul Metropolitan Government Institute of Public Health and Environment, Seoul, Republic of Korea.
Chemosphere. 2013 Nov;93(9):1796-803. doi: 10.1016/j.chemosphere.2013.06.019. Epub 2013 Jul 6.
Peroxyacetyl nitrate (PAN) in air has been well known as the indicator of photochemical smog due to its frequent occurrences in Seoul metropolitan area. This study was implemented to assess the distribution characteristics of atmospheric PAN in association with relevant parameters measured concurrently. During a full year period in 2011, PAN was continuously measured at hourly intervals at two monitoring sites, Gwang Jin (GJ) and Gang Seo (GS) in the megacity of Seoul, South Korea. The annual mean concentrations of PAN during the study period were 0.64±0.49 and 0.57±0.46 ppb, respectively. The seasonal trends of PAN generally exhibited dual peaks in both early spring and fall, regardless of sites. Their diurnal trends were fairly comparable to each other. There was a slight time lag (e.g., 1 h) in the peak occurrence pattern between O3 and PAN, as the latter trended to peak after the maximum UV irradiance period (16:00 (GJ) and 17:00 (GS)). The concentrations of PAN generally exhibited strong correlations with particulates. The results of this study suggest that PAN concentrations were affected sensitively by atmospheric stability, the wet deposition of NO2, wind direction, and other factors.
过氧乙酰硝酸酯（PAN）在空气中是光化学烟雾的指示剂，因为它在首尔大都市区频繁出现。本研究旨在评估大气 PAN 与同时测量的相关参数的分布特征。在 2011 年的一整年期间，在韩国首尔大都市的两个监测点——光进（GJ）和江西（GS），以每小时的间隔连续测量 PAN。在研究期间，PAN 的年平均浓度分别为 0.64±0.49 和 0.57±0.46 ppb。PAN 的季节性趋势通常在早春和秋季都呈现双峰，无论地点如何。它们的日变化趋势彼此相当可比。O3 和 PAN 之间的峰值出现模式存在轻微的时间滞后（例如，1 小时），因为后者在最大紫外线辐照度期间（GJ 为 16:00，GS 为 17:00）之后达到峰值。PAN 的浓度通常与颗粒物表现出很强的相关性。本研究的结果表明，PAN 浓度受大气稳定性、NO2 的湿沉降、风向和其他因素的敏感影响。
