It was likely quieter on average and likely not working during the night. BTW, I grew up a few blocks away from a steel foundry, and it typically was emitting

It was likely quieter on average and likely not working during the night. BTW, I grew up a few blocks away from a steel foundry, and it typically was emitting a low humming noise. It faded into the background and was not a problem. We could hear loud clangs from time to time, but not at night.