... datathrough time (Salcedo, et al., 1999). Time series analysis A time series is a set of observations that arearranged chronologically. In time series analysis, theorder of occurrence of the observation ... matrix of selected pollutants(*: Significant at 5%, **: Significant at 1%)preliminary understating of the time behavior of the series. Fig.1. shows time series plot of selected time series ... (1993).Standardized time series The above analysis will show us whether airpollutant are dependent on time or not but in airpollution time series analysis, it would be useful tofind time periods of risky...