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# HKMetadataKeyAudioExposureLevel

The audio level associated with an audio event.

```
let HKMetadataKeyAudioExposureLevel: String
```

## Discussion

Use this key on audio exposure events. It takes an [`HKQuantity`](/documentation/HealthKit/HKQuantity) containing the audio level measured in [`decibelAWeightedSoundPressureLevel()`](/documentation/HealthKit/HKUnit/decibelAWeightedSoundPressureLevel()) units.

---

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