As carmakers have included fake noise to their cars, perhaps cities might do the same thing as they go quiet.

These devices have the potential to maks sound completely for individuals.

Currently, aviation is being taxed for their noise pollution, but as cities get quieter there might be a need to tax individuals instead.

Noise pollution maps allowing individuals understand the sound in different areas can help with choises of real estate purchasing and others.

Silent fireworks are what they sound like, quite light shows, for cities that want to take care of their biodiversity.

New types of tarmac create less friction on the road surfaces and thus almost a quite road surface.

Acoustic metamaterials based on plastic and latex are designed to control, direct and manipulate sound. In addition, they can be used to create unidirectional devices that that pass acoustic energy in only one direction (non-reciprocal acoustics), which could be of use for several applications, from acoustic insulation to personal audio playback.

Narrowcasting is a term that describes delivering information or media to a specific or narrow group of people. This can now be done with sound, letting an individual get the specific message.

Meta-materials could help us silence buildings and cities through the use of these novel material applications.

As these conversational interfaces include, there may be further noise pollution inside, after the proliferation of these devices.