Quantifying the ozone “weekend effect” at various locations in Phoenix, Arizona

摘要: Abstract Analysis of pollution data from a network monitors in Maricopa County, Arizona, reveals considerable variation the magnitude ozone “weekend effect” depending on how and where it is measured. We used four separate methods to calculate weekend effect, all which showed that phenomenon stronger urban core, produced. Spatial linear regressions show effect goodness fit weekly harmonic cycles function urbanization, described quantitatively using an index traffic counts, population, employment within 4 km buffer zone monitoring sites. diurnal patterns as well oxides nitrogen (NOx) at representative site core supports hypothesis lower levels NOx Sundays reduce degree titrated, resulting higher minimum hence mean for day week (DOW). Fringe sites, concentrations are absolute terms than almost no effect,” regardless individual we used. Alternative quantification statistically significant DOW differences fringe locations, albeit out phase with cycling core. Our findings suggest multiple metrics need be test causes may location specific.