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Considering the scientific evidence on the threshold of night noise exposure indicated by L night as defined in the Environmental Noise Directive (2002/49/EC), L night value of 40 dB should be the target of the night noise guideline (NNG) to protect the public, including the most vulnerable groups such as children, the chronically ill and the elderly. L night value of 55 dB is recommended as an interim target for countries which cannot follow NNG in the short term for various reasons and where policy-makers choose to adopt a stepwise approach. These guidelines may be considered an extension to the previous World Health Organization (WHO) guidelines for community noise (1999).