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Acoustic noise pollution is currently a global environmental problem. Many citizens are interested in the following question: what is the level of noise pollution where I live, work, or travel? Does it meet standards? How to provide noise protection created by the development of cyber-physical systems? An ordinary citizen cannot monitor noise by standard methods. This process is complicated, and the required equipment is expensive. However, modern mobile phones’ computing, communication, and sensory functions allow monitoring. To do this, they need simple and straightforward methodologies. The article proposes a simple monitoring methodology. Several experiments are being carried out.