World Health Organization

Measure Noise Pollution using Free NIOSH Sound Level Meter Smartphone App

[Revised July 10, 2019] There are lots of Smartphone sound level meter apps, but most aren’t accurate or free. Many pretend to be free but cost money to change the default settings to public health recommended settings for environmental noise. The noise scientists at the National Institute of Occupational Safety & Health in the U.S. …

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