On 21 January 2010, the EPA announced the Environmental Sound Level Standards（環境音量標準） to protect peace and quiet. In accordance with Article 20 Paragraph 3 of the Noise Control Act（噪音管制法）, the EPA also formulated the Environmental Noise Measurement Methods and preannounced that the draft of the Environmental Aircraft Noise Measurement Methods （環境中航空噪音測量方法） will be finalized and take effect on 15 February 2016.

The new measurement method uses a CNS 7129 type-1 noise meter (also called a sound level meter) that conforms to Taiwan’s national standards, or an IEC 61672 Class 1 noise meter that conforms to the International Electrotechnical Commission standards, to measure aircraft noise levels. The noise levels measured will be used to determine readings of aircraft noise indicators, such as day-night average sound level (DNL). The announced measuring methods will be applicable to facilities for monitoring non-stationary aircraft noise in the proximity of airports, and for measuring indoor DNL.

Excerpt from Environmental Policy Monthly, 18 (9)