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    "NoiXApp" is a crowdsourcing solution developed by the National Institute of Oceanography and Applied Geophysics - OGS to measure acoustic pollution in urban areas using the microphones of mobile phones. The solution is based on a mobile (Android and iOS) software application in which it is possible to acquire urban noise data performing the recording and calculation of the levels of the sound pressure. Georeferenced data are transmitted to the OGS infrastructure, the data are anonymized, integrated, validated and mapped onto an open-data web portal.