But during the epidemic, researchers noted that noise levels were sharply lower in urban areas. In fact, they were consistent with the flow of traffic in the mid-1950s.
“In other words, the Covid-19 shutdown created a legendary silent spring throughout the SF Bay area,” the researchers noted.
Analyzing traffic flow data from the Golden Gate Bridge, the researchers found that vehicle crossings from April to May 2020 returned to post-1954 levels. While sound recordings have not been available since the 1950s, the researchers said this indicates a brief but dramatic change. Human behavior more effectively than half a century of urban noise pollution
Birds responded by producing high-performance songs at low amplitudes, with maximum communication distance and euphoria.
“We found that birds sang more softly before and during shutdowns when noise levels were low and at short distances from recording,” the researchers said in the study.
Although birds sing more softly, studies have found that communication distances are almost doubled, species health increases, and the likelihood of mating increases.
“In addition, the signal-to-noise ratio in the respective energy state doubles, which helps explain media reports suggesting that bird songs are heard louder during shutdowns,” the researchers said.
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