# Impact of the COVID-19 Lockdown Measures on Noise Levels in Urban Areas—A Pre/during Comparison of Long-Term Sound Pressure Measurements in the Ruhr Area, Germany

> Research article (International Journal of Environmental Research and Public Health, 2021) · cited 37× · AI/ML

**Wikidata**: [openalex:W3159452670](https://www.wikidata.org/wiki/openalex:W3159452670)  
**Source**: https://4ort.xyz/entity/impact-of-the-covid-19-lockdown-measures-on-noise-levels-in-urban-areasa-pre-during-comparison-of-long-term-sound-pressu