The current standard is developed for the purpose of implementing the Law of the People's Republic of China on Environmental Protection, Law of the People's Republic of China on Environment Impact Assessment and Law of the People's Republic of China on the Prevention and Control of Environmental Noise Pollution, protecting the environment, preventing and controlling noise pollution, standardizing and guiding environment impact assessment of acoustic environment. The current standard stipulates such contents as principle, contents, work procedures, methods and requirements for noise impact assessment. The current standard is applicable to noise impact assessment in environment impact assessment of construction projects and plans. The current standard is the revision of Technical Guidelines for Noise Impact Assessment (HJ/T2.4-1995) issued in 1995 for the first time. This is the first revision. HJ/T 2.4-1995 will be nullified since the date when the current standard puts into effect.

Technical Guidelines for Noise Impact Assessment (HJ 2.4-2009)