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In this work, the use of Recurrence Plots and Recurrence Quantification Analysis explores the changes in the non-linear behavior of harmful airborne particle concentration in four sites around London simultaneously. This research has been carried out for 6 years, using large datasets of raw data (hourly) for harmful particles such as CO, SO 2 , NO 2 , NO and Particulate Matter (PMx). Recurrence analysis has been shown to be a useful tool in many disciplines to find trends, rates anddoi:10.5923/j.ajee.20110101.02 fatcat:mna7c4ec4zeg5m3hqorr73qppq