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Measuring Environmental Sound Levels with Your iPhone

In today's world, where noise pollution is a growing concern, monitoring environmental sound levels becomes increasingly important. Fortunately, your iPhone and Apple Watch can be valuable tools for measuring and tracking the noise around you. This article delves into how you can leverage these devices, along with specific apps and features, to stay informed about your noise exposure and protect your hearing.

NIOSH Sound Level Meter App

Using the Noise App on Apple Watch and iPhone

When you pair your Apple Watch with your iPhone and set up the Noise app on Apple Watch, environmental sound levels are automatically sent from Apple Watch to the Health app on iPhone. To view your exposure to environmental noise levels over time, follow these steps:

  1. Go to the Health app on your iPhone.
  2. Tap Hearing at the bottom right.
  3. Tap Environmental Sound Levels, then do any of the following:
    • View exposure levels over a time period: Tap the tabs at the top of the screen.

When noise in your environment reaches a level that might affect your hearing, you can get a notification from Apple Watch on your iPhone. To view the details about a notification, do the following:

  1. Go to the Health app on your iPhone.
  2. Tap Summary at the bottom left.
  3. Tap the notification near the top of the screen, then tap Show More Data.
How to use the Noise app on Apple Watch

Utilizing iPhone Apps for Sound Measurement

Several apps available on the App Store can transform your iPhone into a sound level meter. One notable app is "Decibel X," which offers pre-calibrated measurements and supports dBA and dBC. It precisely measures the sound pressure level (SPL) around you, making it a useful tool for various purposes.

Key features of "Decibel X" include:

  • Trusted accuracy: The app is tested and pre-calibrated for all Apple devices.
  • FFT and BAR graphs to display real-time FFT, useful for frequency analysis and musical tests.
  • Beautiful, intuitive, and carefully crafted UI design.
  • Custom calibration is suggested for serious purposes requiring higher precision and accuracy, although all devices are pre-calibrated.
Decibel X App Screenshot

To use a sound level meter app, follow these general steps:

  1. Start the app.
  2. The screen will display the noise level you're experiencing in real-time, shown in large numbers at the top.
  3. Start the measurement. Note that the app is simply measuring the amount of sound energy present during your measurement and is not recording audio.
  4. The screen will display the duration of the measurement.

Accuracy of iPhone Sound Measurement Apps

It's important to note that there can be significant variation in the ability of iPhone apps to accurately predict environmental dB levels. A study evaluating several apps found that the NIOSH (National Institute for Occupational Safety and Health) Sound Level Meter was the most effective, with an R2 value of 0.97.

Considerations for Occupational Noise Monitoring

The Control of Noise at Work Regulations, which came into force in Great Britain in 2005, require all work environments to be monitored for potentially harmful noise exposure levels. When selecting an app for this purpose, consider its accuracy and reliability. The NIOSH Sound Level Meter is a good option, as it was found to be the most accurate in the aforementioned study.

Real-World Applications

These apps can be incredibly useful in various situations. For instance, you can log noise levels near a race circuit or document excessive noise from neighbors. They can also assist in optimizing your home audio system by providing detailed fractional octave band analysis.

Data Privacy

When choosing a sound measurement app, consider its data privacy practices. Some apps may collect usage data and diagnostics, but this data may not be linked to your identity. Always review the app's privacy policy before using it.

Troubleshooting

Some users have noted that the ability to check ambient sound levels via the ear icon in the iPhone's control center may be limited or unavailable without headphones. This feature might be more readily accessible through the Apple Watch or when using headphones.

Additional Resources

For more information on occupational noise exposure and hearing loss prevention, consult the following resources:

  • National Institute for Occupational Safety and Health (NIOSH). Criteria for a Recommended Standard: Occupational Noise Exposure. Department of Health and Human Services, NIOSH; 1998. Publication No.
  • Health and Safety Executive. Noise at work regulations.
  • Kardous CA, Shaw PB. Evaluation of smartphone sound measurement applications.
  • Sataloff RT, Sataloff J. Occupational Hearing Loss.
Hearing Loss Prevention
Comparison of Noise Measurement Apps
App Name Accuracy (R2 Value) Developer
NIOSH Sound Level Meter 0.97 EA LAB, Slovenia
Decibel X N/A SkyPaw Co., Limited