Correspondence on “Highly Volatile POPs in Urban Air across Asia and Africa: Dominance of Volatile Methylsiloxanes”

We read with great interest the recent article by Xiao et al. that presented persistent volatile organic compound measurements across six major cities in Asia and Africa. (1) We were particularly interested in their measurements of volatile methyl siloxanes (VMS), which have rarely or never been reported in many of the studied regions (Figure 1). These new measurements provide an opportunity to perform comparisons to the novel global VMS model described in Brunet et al. (2) Here, we explore these comparisons to evaluate emission factors and model representation in these previously understudied locations.