Noise Reduction - Three Methods To Reduce Traffic Noise

Methods to reduce external noise level.
1. Closing up windows and balcony doors reduces external noise level.
2. Hanging curtains, day and night curtains drawn together, certainly reduces the noise level further.
3. If still not satisfied with the two methods above, then you have to install secondary glazing for windows and balcony doors. The video clip below shows the effectiveness of secondary glazing.