Seasonal and diurnal variations of PM1.0, PM2.5 and PM10 in the roadside environment of hong kong--颗粒学报PARTICUOLOGY

Cheng, Y., Ho, K. F., Lee, S. C., & Law, S. W. (2006). Seasonal and diurnal variations of PM1.0, PM2.5 and PM10 in the roadside environment of hong kong. China Particuology, 4(6), 312-315. https://doi.org/10.1016/S1672-2515(07)60281-4

Seasonal and diurnal variations of PM_1.0, PM_2.5 and PM₁₀ in the roadside environment of hong kong

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

Research Center of Urban Environmental Technology and Management, Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

10.1016/S1672-2515(07)60281-4

Volume 4, Issue 6, December 2006, Pages 312-315

Received 15 May 2006, Accepted 6 October 2006, Available online 14 December 2007.

E-mail: ceslee@polyu.edu.hk

Highlights

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. PM2.5 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.

Graphical abstract

Keywords

PM_1.0; PM_2.5; PM₁₀; seasonal variations; roadside environment; Hong Kong

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