Emergency siren loudness proxies track ambient noise rise over decades

Evidence

When a simple solution to a problem exists, an administrator will usually prefer a gummy one. I have already suggested that a simpler way to calculate the ambient noise increase would be to measure the sound signals of the community. The assumption would be that the level of ambient noise would rise in proportion to social signals, which must always remain above it. We did this for Vancouver by measuring the sound levels of different fire engine sirens, beginning with a 1912 La France device (88-96 dBA) and concluding with the newest 1974 siren (114 dBA), all measured at a distance of 3½ to 5 meters. This showed that the signals of emergency vehicles had risen some 20 to 25 decibels in sixty years, or nearly half a decibel per year on the average. — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 625

Categorization

• SEED: A replicable field method the reader could use: archival signal measurements as a proxy for ambient noise history.
• corroborated: 2 independent passages support this claim — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 625
• XREF: connects to: Siren loudness has risen from 95 to 122 dBA over a century; Siren volume has risen steadily across a century. — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 561; Ocean ambient noise levels have risen dramatically over the past sixty years — George Michelsen Foy, Zero Decibels: The Quest for Absolute…, 354 (+1 more)

Broader Connections

• Ocean ambient noise levels have risen dramatically over the past sixty years #corroborates (0.80) — George Michelsen Foy, Zero Decibels, 354