The dataset comprises three files, each containing geo-referenced information with corresponding timestamps. The names of the four ponds are written in French according to the official name defined by Brussels Environment (BE) (i.e. Leybeek, Pêcheries, Tenreuken and Silex). · DATA_Dissolved contains water temperature (°C), Chlorophyll-a concentration (µg L-1), oxygen saturation (%O2, in %), total suspended matter concentration (TSM, in mg L-1), inorganic nutrients (nitrate : NO3-, nitrite : NO2-, ammonium : NH4+, soluble reactive phosphorus : SRP, in µmol L-1), partial pressure of CO2 (pCO2, in ppm) , dissolved CH4 concentration (CH4, in nmol L-1), N2O saturation level (%N2O, in %) and 13C/12C ratio of CH4 (δ13C-CH4, in ‰) collected from June 2021 to December 2023 in four ponds in Brussels. · DATA_Ebullitive contains wind speed (m s-1), water temperature (°C), atmospheric pressure (atm), bubbles flux measured with inverted funnels (mL m-2 d-1), CH4 content in bubbles (%CH4, in %) and 13C/12C ratio of CH4 ...