The AWAIRE project aimed to assess and compare innovative methods for measuring nitrous oxide (N2O) emissions from wastewater treatment plants. Two novel methods for measurement of N2O emission from wastewater treatment plants (Drone Flux Measurement - DFM and Eddy Covariance - EC) were tested and compared to existing methods (Tracer gas Dispersion Method - TDM and Liquid Phase sensors - LPS). The remote sensing methods (TDM and DFM) and LPS-based N2O emission rates were close (less than 20% between DFM/TDM and LPS) based on 38/41 comparative measurement campaigns over 8/15 measurement days carried out at BIOFOS Avedøre. The difference of 20% is less than or comparable to the expected measurement uncertainty for the remote sensing methods. The high temporal resolution N2O fluxes from the EC method showed a strong agreement with regards to emission dynamic when compared with LPS modelled emissions. N2O emissions from wastewater treatment plants are highly dynamic, whereby continuous measurement methods such as LPS may be valuable in determination of yearly emission rates and plant specific N2O emission factors. The project showed that TDM and DFM can be used to validate and optimize emission measurements using LPS.