This standard defines the nois levels to be considered as maximum levels in certain premis s, windows closed, depending on their destination. They take into account external nois such as vehicle traffic nois and industrial nois , as well as internal nois such as neighborhood nois and equipment nois . However, impulsive nois s, such as those coming from shots, explosions, slamming doors or switches (for more details, see is 2204), are excluded.