Seasonal and diurnal variations of PM1.0, PM2.5 and PM10 in the roadside environment of hong kong

China Particuology Pub Date : 2006-12-01 DOI:10.1016/S1672-2515(07)60281-4

Y. Cheng, K.F. Ho, S.C. Lee, S.W. Law

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引用次数: 47

Abstract

PM_1.0 (fine particles, with diameter < 1 μm), PM_2.5 (fine particles, with diameter < 2.5 μm) and PM₁₀ (coarse particles, with diameter < 10 μm) were measured at 24-hour intervals near a high-traffic road in Hong Kong, from October 2004 to September 2005. Mass concentrations were determined for the three particle fractions, averaging for PM_1.0, PM_2.5 and PM₁₀, respectively, 44.5±18.4, 55.4±25.5 and 81.3±37.7 μg·m⁻³. PM_2.5 was 3.7 times the U.S. EPA's annual NAAQS of 15 μg·m⁻³. Overall, PM_1.0 accounted for 44 to 69% (average 57%) of PM₁₀, while PM_2.5 accounted for 58 to 82% (average 71%) in this study. The particulate masses showed obvious seasonal patterns with high concentrations in cold seasons and low in warm seasons, especially high concentrations of PM_2.5-10 during the cold seasons. Diurnal variations of mass concentrations of PM_2.5 were determined during July, showing two major peaks in the morning and afternoon rush hours.

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香港路边环境PM1.0、PM2.5及PM10的季节及日变化

PM1.0(细颗粒，直径<1 μm)、PM2.5(细颗粒物，直径<2.5 μm)和PM10(粗颗粒，直径<从2004年10月至2005年9月，每隔24小时在香港一条交通繁忙的道路附近测量10 μm)。测定三种颗粒物的质量浓度，PM1.0、PM2.5和PM10的平均浓度分别为44.5±18.4、55.4±25.5和81.3±37.7 μg·m−3。PM2.5是美国环保局年度NAAQS (15 μg·m - 3)的3.7倍。总体而言，在本研究中，PM1.0占PM10的44%至69%(平均57%)，而PM2.5占58%至82%(平均71%)。颗粒物质量表现出明显的季节特征，冷季浓度高，暖季浓度低，特别是冷季PM2.5-10浓度较高。对7月份PM2.5质量浓度的日变化进行了分析，发现在高峰时段出现了两个高峰。

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China Particuology

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