Translate the following English sentence to French:
"Firstly, it is obvious from the report that there is still no common method for calculating aircraft noise and, secondly, there is still no common method for monitoring basic data."
Premièrement, d' après le rapport, il n' existe pas encore de méthode uniforme d' évaluation de la pollution sonore et deuxièmement, il n' existe pas non plus de méthode uniforme de surveillance des données d'émission.