# Changes in noise levels in the city of Madrid during COVID-19 lockdown in 2020

> Research article (The Journal of the Acoustical Society of America, 2020) · cited 116× · AI/ML

**Wikidata**: [openalex:W3088802974](https://www.wikidata.org/wiki/openalex:W3088802974)  
**Source**: https://4ort.xyz/entity/changes-in-noise-levels-in-the-city-of-madrid-during-covid-19-lockdown-in-2020