https://wjct.org/uncategorized/2019/02/new-york-city-lawmakers-call-for-less-piercing-emergency-vehicle-sirens/
New York City Lawmakers Call For Less Piercing Emergency Vehicle Sirens - WJCT Public Media
Feb 26, 2019 - Council Member Helen Rosenthal introduced a bill this month after receiving complaints about the impact of wailing ambulances.
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https://mocktheorytest.com/resources/why-are-police-sirens-different/
Emergency vehicle sirens - police, ambulance and fire
Feb 5, 2019 - Why do police car, fire engine and ambulance sirens make a wailing noise, and why has it changed over the years?
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https://www.spservices.co.uk/Accessories/Vehicles/Sirens-and-Lights/c/Sirens-and-Lights-SP
Emergency Vehicle Sirens & Lights | Quality First Aid Kits & Medical Supplies | SP Services
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