How is this even estimated in the software? What are you listening to and on what?

Edit: I see just airpods. Passive isolation will lower the noise from the subway as well. The subway is very loud itself. Also airpods have a metal mesh that get full of earwax. You can use a very fine tooth brush from the brand Curaprox + Isopropyl alcohol to clean it out. They get extremely quiet as they fill up with wax. You might think they don’t even work.