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. 2021 May 28;18(11):5799. doi: 10.3390/ijerph18115799

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Global daily noise indicators in Barcelona during the different lockdown stages in 2020 compared to median 2018 and 2019 values. (a) Global $L d_{2020}$ . (b) Global $L e_{2020}$ . (c) Global $L n_{2020}$ . (d) Global $L d e n_{2020}$ .