Complexity analysis of CO concentrations at a traffic site in Delhi

摘要

The Lempel-Ziv complexity measure is used to examine the complexity in carbon monoxide concentration emissions over time. Rescaled range analysis and dispersion analysis is also carried out to confirm the findings. For this, time series of carbon monoxide concentrations observed between 2000 and 2009 at a traffic site in Delhi are used to examine separately the entire time series, and the series by years and months. The presence of complexity is observed in carbon monoxide concentrations over the period. The analysis showed the long-range correlations up to 15 months. The Lempel-Ziv complexity of time series over different years however indicates complexity in all the years except 2000, 2001 and 2006, reflecting the probable impact of control measures in Delhi.