We compared the noise pollution on a Wednesday in January (before lockdown, blue line) with the noise pollution on a Wednesday in March (during lockdown, green line). The noise pollution at Entfelderstrasse in Aarau has decreased by 2-6 decibels depending on the time of day. Only during the morning peak hour is hardly any reduction visible. Considering that a reduction of noise pollution by 3 decibels corresponds to a halving of traffic, one can easily imagine the huge impact the COVID-19 measures have on the mobility behavior of the people in Aarau. For once, we all wish that the residents along Entfelderstrasse would soon complain about the road noise again.
Monitoring measurements give us the opportunity to better know and understand the development of noise pollution over time. The example with the effects of the COVID-19 measures is only one of many.