How iOS 16 Health Records Noise Level Exposure

This guide explains how Apple's iOS 16 Health app logs and categorizes your auditory exposure. By combining real-time audio measurements from connected headphones with ambient sound readings captured by an Apple Watch, iOS 16 compiles detailed, time-stamped noise exposure logs. These metrics are evaluated against World Health Organization (WHO) standards to help users monitor hearing safety and prevent sound-induced hearing damage.

Data Sources for Noise Logs

iOS 16 Health records noise data from two primary sources:

  1. Headphone Audio Levels: When you listen to media using AirPods, Beats, or other compatible headphones, the iPhone continuously measures the output volume in A-weighted decibels (dBA). If you use third-party wired or Bluetooth headphones, you can classify them as headphones in Bluetooth settings so iOS applies accurate measurement algorithms.
  2. Environmental Sound Levels: Ambient noise levels are sampled using the microphone on a paired Apple Watch running watchOS 9. The Watch samples ambient sound periodically throughout the day without recording or saving actual audio files, then syncs these decibel readings directly to the iPhone Health app.

How Exposure Is Calculated and Classified

The Health app categorizes exposure into two main tiers based on sound intensity and duration:

  • OK: Sound levels below 80 dB. Long-term exposure at this level is generally considered safe for human hearing.
  • Loud: Sound levels repeatedly exceeding 80 dB. Prolonged exposure at this threshold can cause temporary or permanent hearing impairment.

iOS 16 utilizes a 7-day rolling exposure calculation known as a "hearing dose." For instance, standard guidance permits up to 40 hours of exposure to 80 dB per week before reaching 100% of the safe limit. As decibel levels increase, the safe exposure time drops drastically (e.g., 90 dB limits safe exposure to roughly 4 hours per week). If you exceed 100% of your weekly dose, iOS logs an alert and automatically sends a headphone notification to lower the volume.

Viewing the Exposure Logs in iOS 16

To review your recorded noise exposure history:

  1. Open the Health app on your iPhone running iOS 16.
  2. Tap the Browse tab in the bottom right corner.
  3. Select Hearing.
  4. Tap either Headphone Audio Levels or Environmental Sound Levels.

Inside each category, data is charted across Day (D), Week (W), Month (M), and Year (Y) views. Scrolling to the bottom and tapping Show All Data displays raw, chronological logs showing exact decibel levels, recording timestamps, and the specific device used to capture the measurement.