Welcome to Hush City!


Hush City’s Icon © Antonella Radicchi 2017

Click here to download Hush City app on iTunes | Click here to download Hush City app on Google Play


Hush City is a free, citizen science mobile app, which empowers people to identify and assess quiet areas in cities to create an open-access, web-based map of quiet areas, with the potential of orientating plans and policies for healthier living, in response to issues framed by European environmental policies (e.g. the EC END 49/2002).

Launched in 2017 within the context of a pilot study in Berlin, Hush City is now used internationally and available in 5 languages: English, German, Italian, Spanish and Portuguese.

Hush City has been adopted by the City Councils of Berlin (2018) and Limerick (2019-present) within the context of the creation of the Quiet Areas Plans.

Join the Hush City community. It is simple!

  • Download the free Hush City app and install it on your smartphone
  • Go to one of your favourite quiet places
  • Launch the Hush City app and click on the button “Map the quietness around you”
  • Record the sound of the quiet place where you are and measure its sound levels*
  • Take a picture of the place where you recorded the sound
  • Answer the questions addressing the environmental quality of this quiet place
  • Share this information with the Hush City community.

Or, use the app to find a quiet spot near you. Go to it and enjoy spending some time there.

* Please be aware that noise levels measured by the mobile app, may not be entirely accurate, depending on which smartphones are used, weather conditions and other factors.

See what Hush City can do!

Watch the Hush City Teaser here. This video was made by Limerick City & County Council, with the support of the EPA.

Main features of the Hush City app

Using the Hush City app, you can:

  • Crowdsource  your favourite quiet areas and share them with the Hush City community;
  • Identify and access quiet areas in your city or other cities worldwide, shared by the Hush City users;
  • Filter the quiet areas according to their sound levels, descriptors used to tag them, quietness, visual quality and accessibility, as perceived by the users who crowdsourced the quiet areas;
  • Share the quiet areas via social media;
  • Review your surveys and delete them anytime without justification;
  • Become a Hush City Ambassador;
  • Give feedback on the Hush City project.

Hush City Map

The quiet areas crowdsourced with the Hush City app are open access and available online via the Hush City Map.

Impact of Hush City 


  • 2021 John Connell Soundscape Award.
  • 2019 Prix BLOXHUB Interactive, Category: Excellence, Honorary mention. Theme: “Making Urban Space More Liveable Using Digital Technology”.
  • 2016 Falling Walls Young Innovator of the Year Award, Finalist.

Credits & Acknowledgments

Hush City has been invented by Dr. Arch. Antonella Radicchi.
The Hush City’s idea originates from the concept of the Hush Expo app envisioned by Dr. Arch. Antonella Radicchi for the EXPO Milan in 2015, whose mock-up was designed by Dr Arch. Antonella Radicchi in collaboration with Roberto Lombardo.
Hush City has subsequently been developed and implemented by Dr. Arch. Antonella Radicchi at the Technical University of Berlin, in her role as the Principal Investigator of the following projects:

  •  “Beyond the Noise: Open Source Soundscapes” (2016, April – 2018, March) funded by the IPODI-Marie Curie Fellowship – People Program (TU Berlin/IPODI grant agreement no. 600209)
  •  “Hush City Mobile Lab” (2018, April – 2020, March) funded by the HEAD-Genuit Foundation [research grant P-17/08-W].

Since April 2020, Hush City has been financially supported by Dr. Arch. Antonella Radicchi.

Project Supervisors: Prof. Dr. Dietrich Henckel (Technical University of Berlin), Dipl. Ing. Jörg Kaptain (Berlin Senate, Senate Department for the Environment, Transport and Climate Protection).
Soundscape Advisor: Prof. Dr. Brigitte Schulte-Fortkamp (Technical University of Berlin).
Acoustic Advisors: Dipl. Ing. Michael Jäcker-Cüppers (ALD, Technical University of Berlin), Dipl. Ing. Manuel Frost (Berlin Senate, Senate Department for the Environment, Transport and Climate Protection), Dipl. Ing. Mattia Cobianchi (Bowers & Wilkins, UK).
The implementation of the Portuguese language in the mobile and web-based version of the app was funded by the Brazilian Association for Acoustical Quality – ProAcustica.


Hush City app is a free, native mobile application, which runs on both iOS and Android operating systems: iOS 9.0 and higher (iPhones 5/5C/5S/SE/6/6Plus/7/7Plus) and Android 5 and higher (any Android-based smartphone).
A Titanium platform is used as a framework to record and store the data and a LAMP stack is used as a repository.
Audio data are sampled at 44.100Hz, with a resolution of 16bit. The maximum length of the audio file is 30 seconds.
Pictures are collected at a maximum resolution of 6MP and 24bit colour.
Sound pressure levels are calculated as numeric scale values and they are A-weighted (i.e. 45 dB(A)). Leq (equivalent continuous sound level), Lmin (minimum sound level) and Lmax (maximum sound level) are also calculated and displayed. NoiseTube’s app libraries have been consulted to select the most appropriate formulas for sound pressure level calculation. These formulas have been also double-checked by a team of acoustic advisors involved in the project (see credits list below).

Privacy Policy – Terms and Conditions of Use

Your privacy is important to us. Please review Hush City’s Privacy Policy and Terms and Conditions carefully.

Why is it important to map and assess quiet areas with the Hush City app?

Our cities are becoming noisier by the hour. Only in Europe, over 125 million people are affected by noise pollution from traffic every year (EEA 2014), and apparently, quietness is becoming a luxury available only to a few of us. By using this free mobile app, you will contribute to making quietness available to all those who appreciate it.

The Hush City app will help you to identify, access and evaluate everyday quiet areas in your neighbourhoods. You can find places such as small, quiet spots where you can go to escape the city chaos, relax, read a book, play with your kids, and have a pleasant conversation.

More information can be found in our open-access publications.