TY - GEN
T1 - Hourly PM2.5 extremes variation in conjunction with meteorology in urban Hong Kong
AU - Dai, Qun
AU - Luo, Ming
AU - Wang, Jingzhi
AU - Schnabel, Marc Aurel
PY - 2011/10/3
Y1 - 2011/10/3
N2 - Atmospheric aerosol particles with diameters of less than 2.5 mm (PM2.5) have significant health effects on both human and various ecosystems. With increasing traffic and energy consumption, PM2.5 has become the main type of air pollutant in Hong Kong, and extreme concentrations of PM2.5 appear to occur more frequently. This paper investigates the variations in the extreme hourly PM2.5 concentrations from the Air Pollution Index (API) monitoring station in Central - Hong Kong, which represents a typical urban area of Hong Kong. The hourly PM2.5 concentration exhibits the distinct seasonal and diurnal variations, which were impacted by traffic strength and meteorological conditions. The analysis results reveal that firstly, significant diurnal bimodal pattern of PM2.5 with peaks in morning (8:00-10:00am) and afternoon rush hours (18:00-20:00pm) are noted, lowest concentrations are generally found around noon time (12:00-14:00pm). Secondly, seasonal variations of PM2.5 concentrations with their highest concentration during winter and lowest during summer times, which are driven by seasonal variability in wind directions and temperatures. Thirdly, the pronounced variations are commonly contributed to anthropogenic factors, such as enhanced traffic density, yet meteorological conditions also have some significant influence in Hong Kong.
AB - Atmospheric aerosol particles with diameters of less than 2.5 mm (PM2.5) have significant health effects on both human and various ecosystems. With increasing traffic and energy consumption, PM2.5 has become the main type of air pollutant in Hong Kong, and extreme concentrations of PM2.5 appear to occur more frequently. This paper investigates the variations in the extreme hourly PM2.5 concentrations from the Air Pollution Index (API) monitoring station in Central - Hong Kong, which represents a typical urban area of Hong Kong. The hourly PM2.5 concentration exhibits the distinct seasonal and diurnal variations, which were impacted by traffic strength and meteorological conditions. The analysis results reveal that firstly, significant diurnal bimodal pattern of PM2.5 with peaks in morning (8:00-10:00am) and afternoon rush hours (18:00-20:00pm) are noted, lowest concentrations are generally found around noon time (12:00-14:00pm). Secondly, seasonal variations of PM2.5 concentrations with their highest concentration during winter and lowest during summer times, which are driven by seasonal variability in wind directions and temperatures. Thirdly, the pronounced variations are commonly contributed to anthropogenic factors, such as enhanced traffic density, yet meteorological conditions also have some significant influence in Hong Kong.
KW - Diurnal variation
KW - Extreme concentration
KW - Hong Kong
KW - Meteorology
KW - Particulate Matter
KW - PM2.5
UR - http://www.scopus.com/inward/record.url?scp=84865699784&partnerID=8YFLogxK
M3 - Conference Proceeding
AN - SCOPUS:84865699784
SN - 9781618394972
T3 - 32nd Asian Conference on Remote Sensing 2011, ACRS 2011
SP - 208
EP - 213
BT - 32nd Asian Conference on Remote Sensing 2011, ACRS 2011
T2 - 32nd Asian Conference on Remote Sensing 2011, ACRS 2011
Y2 - 3 October 2011 through 7 October 2011
ER -
