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摘要
Differences in ozone (O-3), nitrogen oxides (NOx), and respirable suspended particulate (RSP) weekday and weekend concentrations in Hong Kong were investigated. Data were collected hourly by the Hong Kong Environmental Protection Department from January 1999 to October 2007 at 14 sites: 9 urban, 4 newly developed, and 1 rural station. Weekend O-3 concentrations were 14% and 22% higher for the afternoon peak O-3 time and 8-h O-3 average concentrations, respectively, at six urban stations, whereas NO2 and NOx concentrations were 19% and 25% lower, respectively, during the afternoon O-3 peak time on weekends. No significant differences in peak afternoon O-3 concentrations were found at the newly developed or rural stations. Weekend RSP concentrations were lower at most urban stations. Urban RSP concentrations were lower on weekends than weekdays, by 14% for the morning rush hour and 8% for the daily average RSP. O-3 formation sensitivity to volatile organic compounds and lower weekend NOx emissions could explain the O-3 weekend effect in urban Hong Kong. Lower weekend RSP concentrations are predominantly the result of fewer anthropogenic emissions, primarily due to decreased traffic flow.
- 出版日期2012-1
- 单位中国环境监测总站
