摘要: This study was conducted by DRI and STI over a period of 30 months beginning in December 1999. In the initial phase of the study, DRI examined the spatial, temporal, and statistical distributions of ozone, carbon monoxide, total n... 展开 This study was conducted by DRI and STI over a period of 30 months beginning in December 1999. In the initial phase of the study, DRI examined the spatial, temporal, and statistical distributions of ozone, carbon monoxide, total non-methane hydrocarbons, and nitrogen oxides for routine monitoring sites in the SoCAB with continuous data from 1981 to 1998. The purpose of this study is to derive a conceptual explanation of the weekend ozone effect that is consistent with the fundamentals of ozone photochemistry, historic trends in the magnitude and spatial extent of the weekend effect, the diurnal and day-of-the-week variations in ambient VOC and NO-x concentrations and VOC/NO-x ratiosi, and the diurnal and day-of-the-week variations and source contributions of VOC and NO-x. Several hypotheses have been proposed to explain the weekly behavior of ozone in the SoCAB. These hypotheses are similar to those proposed by the California Air Resources Board (ARB, 2001). 收起