<b>Sustainability of global small-scale constructed wetlands for multiple pollutant control</b>

196 qualified publications involving 364 CW sites were used to extract information related to water quality parameters. The following information from each original paper: (1) location, including latitude, longitude, country, and continent; (2) CW types, i.e., free water surface flow CWs (FWSCWs), subsurface flow CWs (SSFCWs), floating CWs (FCWs) and hybrid CWs (HCWs)^8,57; (3) area (m²); (4) removal efficiency (%) and loading rate (g m^-2 d^-1) of TN, TP, COD, and NH₄⁺-N.