Monitoring Air Quality by Statistical Control Charts

บทคัดย่อ

Abstract

The Exponentially Weighted Moving Average (EWMA) control charts are used to monitor the air quality data of urban and industrial areas of Muscat. Weekly 8-hours maximum concentrations of Carbon Monoxide (CO) over a period of one year were found to have significant first order autocorrelation. Therefore, Box-Jenkins ARIMA models were fitted and residuals were taken to apply EWMA. It was observed that the data in both areas are within the international standard limit.

Keywords: ARIMA, EWMA, Air Quality, Control Charts