Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31236
Title: Long-memory characteristics of urban roadside air quality
Authors: Lau, JC
Hung, WT 
Yuen, DD
Cheung, CS 
Keywords: Carbon monoxide
Roadside air quality
Long memory
ARIMA model
Issue Date: 2009
Publisher: Pergamon Press
Source: Transportation research. Part D, Transport and environment, 2009, v. 14, no. 5, p. 353-359 How to cite?
Journal: Transportation research. Part D, Transport and environment 
Abstract: Carbon monoxide is a major contributor to air pollution in urban cities, particularly at the roadside. Hourly, monthly and seasonal mean carbon monoxide concentration data are collected from a roadside air monitoring station in Hong Kong over 7-years. The station is a few metres from a major intersection surrounded by tall buildings. In particular, hourly patterns of concentrations on different days of the week are investigated. The data show that hourly carbon monoxide concentrations resemble the traffic pattern of the area and tend to be lower in the summer. Using a seasonal autoregressive integrated moving average models shows that the daily traffic cycle strongly influences concentrations. Further, it is found that urban roadside carbon monoxide monitoring data exhibits a long-memory process, suggesting that a model incorporating long memory and seasonality effects is needed simulate urban roadside air quality.
URI: http://hdl.handle.net/10397/31236
ISSN: 1361-9209
DOI: 10.1016/j.trd.2009.04.002
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