Urban noise levels are a complex mixture of noise from transportation, factories, industries, machines, and people. 7. Sources •Basically, noise sources can be grouped into three types: Transportation, Industrial, and Residential.

There are many sources of noise pollution, but here are some of the main ones:

• Traffic noise. Traffic noise accounts for most polluting noise in cities.
• Air traffic noise.
• Construction sites.
• Catering and night life.
• Animals.
• Physical.
• Psychological.
• Sleep and behavioural disorders.

Broadly speaking , the noise pollution has two sources, i.e. industrial and non- industrial.

The most straightforward method to detect a noise source is to map the Sound Pressure Level (SPL) at various locations around the noisy product. The SPL is measured with a single channel FFT or 1/3 octave analyser at each point of a defined grid.

Low-frequency noise is common as background noise in urban environments, and as an emission from many artificial sources: road vehicles, aircraft, industrial machinery, artillery and mining explosions, and air movement machinery including wind turbines, compressors, and ventilation or air-conditioning units.

If the sound is described as very low frequency, measure down to 10 Hz or below. Measure narrow bands to look for tones, not just 1/3 or 1/1 octave bands. Make audio recordings. Measure vibration levels on the room floor and walls if there is no obvious source of a low-level sound.

IT CAN’T be seen or heard; it can be indoors or outside; it’s not biological, environmental or radiation, but it can make you sick or even kill you.

A bass drum, thunder, and a man’s deep voice are low- frequency sounds. A high-pitched whistle, squeal, and a child’s voice are high-frequency sounds. Intensity is how loud or soft a sound is. If a sound is loud, it has a high intensity.

Instructions

1. Use an Isolation Box.
2. Install a Drywall.
3. Use Soundproof Curtains.
4. Use Soundproof Blankets.
5. Consider Fiberglass Insulation.

Observed symptoms of low frequency noise sensitivity are: feelings of irritation, headache, nausea. disorienta- tion, digestive disorders, disturbed or no sleep.

Here are some ways you can block bass or low frequency sound waves:

1. Add drywall as a sound barrier.
2. Decouple the wall.
3. Insulate any wall cavities.
4. Use an isolation box for small appliances.
5. Build a DIY window plug.
6. Use soundproof curtains.
7. Be sure to seal any gaps around the home.
8. Install some bass traps.