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Urban aerosol particulates on Hong Kong roadsides: size distribution and concentration levels with time

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Abstract

A detailed study on particulate matter from vehicle emission was carried out at roadsides in Hong Kong downtown area. The study aims to explore the variations of particulate matter at roadsides in morning and afternoon. Data of concentrations of different size groups of particulate matter were collected and analyzed. It was found that the particulate levels generally vary periodically with traffic signal changes. During the green traffic light period, concentrations of the particulate matter increase to peak point and then diffuse to a relatively stable level in the red traffic light period. Such stable level is regarded as background level, to which pedestrians are exposed when they walk-by and cross the zebra zones. To analyze and further explore the collected data, a statistical distribution model, i.e., goodness-of-fit test, was employed. It was noticed that the lognormal distribution best fits the particulate matter data in both morning and afternoon. In addition, the non-parametric test was also used to assess the differences between morning and afternoon data. The results show that both data sets statistically differ from each other at 5% significance level. It can be deduced that the change of traffic volume, humidity and wind speed between morning and afternoon may cause this difference.

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Acknowledgment

The work was partially supported by research grants from City University of Hong Kong, HKSAR [No. CityU-SRG 7002370], Science & Technology Program of Shanghai Maritime University [No. 20110046], Shanghai Municipal Natural Science Foundation [No. 10190502500] and Shanghai Science Commission Projects [No. 09DZ2250400].

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Authors and Affiliations

  1. Logistics Research Center & Shanghai Engineering Research Center of Shipping Logistics Information, Shanghai Maritime University, Shanghai, 200135, China

    He Hong-di

  2. Department of Building and Construction, City University of Hong Kong, Hong Kong, China

    Lu Wei-Zhen

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  1. He Hong-di
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  2. Lu Wei-Zhen
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Correspondence to Lu Wei-Zhen.

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Hong-di, H., Wei-Zhen, L. Urban aerosol particulates on Hong Kong roadsides: size distribution and concentration levels with time. Stoch Environ Res Risk Assess 26, 177–187 (2012). https://doi.org/10.1007/s00477-011-0465-9

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