I wonder if there is an app that reads the volume level of sound all around?

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At any given time of day or night, and in any type of environment, public or private, near or far away, noise pollution is everywhere to some degree. So there is a need for a sound pollution app that is a gauge that can accurately tell you what levels of sound are being made within your normal hearing range and what their Hertz or HZ levels are and give you a green light to tell you the sound is not harmful just as an app that can tell us what the ultraviolet levels are when we to to check out the weather. Some levels of sound, just as levels of light can be harmful and if we had an app for these it would be great. I have checked into hearing protective earphones that enable you to not only mask most of the very loud sounds around you but enable you to talk on your blu tooth phone with perfect sound clarity. I think we are moving into a better direction as far as sound detection and protection technology is concerned. Any comments about this would be welcome.