Abstract
Abstract Differences in ozone (O3), 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 O3 concentrations were 14% and 22% higher for the afternoon peak O3 time and 8-h O3 average concentrations, respectively, at six urban stations, whereas NO2 and NOx concentrations were 19% and 25% lower, respectively, during the afternoon O3 peak time on weekends. No significant differences in peak afternoon O3 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. O3 formation sensitivity to volatile organic compounds and lower weekend NOx emissions could e...
Published Version
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