Here's a PDF of the referenced study on noise levels in subways: https://www.nyneuroslp.com/presspdf/Subway%20and%20Bus%20Noise%20Levels-%20Paper.pdf https://w

Here's a PDF of the referenced study on noise levels in subways: https://www.nyneuroslp.com/presspdf/Subway%20and%20Bus%20Noise%20Levels-%20Paper.pdf https://www.nyneuroslp.com/presspdf/Subway%20and%20Bus%20Noi...