Monitor audio levels on iPod touch
Use the Health app 
to monitor audio levels from headphones. It can be helpful to understand how long and often you’re exposed to loud volume as it can affect your hearing.
View audio levels
After you connect EarPods, AirPods, and other compatible headphones to your iPod touch, the audio levels are automatically sent to Health.
Note: Measurements are more accurate from AirPods than from headphones connected by wire. Measurements for wired headphones are estimated based on the volume of your iPod touch.
Tap Browse at the bottom right, then tap Hearing.
Tap Headphone Audio Levels or Environmental Sound Levels, then do any of the following:
Learn about the sound level classifications: Tap
.View exposure levels over a time period: Tap the tabs at the top of the screen.
All levels are measured in decibels.
Change the time span displayed in the graph: Swipe the graph left or right.
See details about a moment in time: Touch and hold the graph, then drag to move the selection.
View details about average exposure: Tap Show All Filters, then tap Daily Average.
View a line representing average exposure: Tap Exposure below the graph.
View the high and low range: Tap Show All Filters, then tap Range.
Filter the data by headphones: Tap Show All Filters, scroll to the bottom of the screen, then choose one of your headphones.
View highlights: Scroll down; to see more, tap Show All.