S.T. Rao, I. Zurbenko, E. Zalewsky, R.F. Henry, and J.Y. Ku, Final Report, August, 1996. Mapping Ozone in the Eastern United States , I.G. Zurbenko, S.T. Rao, and R.F. Henry, Environmental Manager, Vol. S.T. Rao and I.G. Zurbenko, J. of the Air and Waste Management Assoc., Vol. Monitors are segregated into those that operate year-round and those that operate only during the summer ozone season. Characteristics of each frequency domain are investigated, including temporal variance and autocorrelation, spatial patterns in means and variances, spatial correlations, and the influence of meteorological conditions.
Seasonal components are higher in the Northeast than in the South.
Contributions of short-term variance to the total are highest in coastal areas and lowest in the Midwest. In absolute terms, the highest short-term variances are in the Northeast and along the Gulf Coast. Exceedance counts were similarly evaluated, but it is not clear how to interpret these results since most monitors will have had very few or no exceedances over the 12-year period examined. A trends analysis for the period 1985 - 1995 was also presented by the authors. After adjusting for temperature fluctuations, negative trends were found at a much larger number of sites.