The study also found that about 11.7 percent of Bangladesh`s population has lost their hearing due to noise pollution. The WHO has identified noise pollution as an underestimated threat that can cause hearing loss, cardiovascular problems, cognitive impairment, stress and depression, etc. In the fight against noise pollution, WHO has recommended three principles: the precautionary principle, the polluter pays principle and the prevention principle. If the ear is exposed to extremely loud noises (more than 100 dB) for an extended period of time, it can cause irreparable damage to our ear. These sounds can damage sensitive structures in the inner ear and cause noise-induced hearing loss (NIHL), which can occur immediately or take a long time to become visible. But the louder the sound, the shorter the time taken by NIHL. It can be temporary or permanent and it can affect one or both ears. In this case, victims usually cannot understand when talking to each other, especially on the phone or in a noisy environment. Although noise and its management are not identified in any of the 17 Sustainable Development Goals (SDGs), noise is a problem that cuts across almost all goals. From an SDG perspective, there is scientific evidence that failure to address noise pollution is a significant challenge to achieving these goals. This study found that about 11.7% of the country`s population had lost their hearing due to noise pollution. According to the report, the noise level during the day was above 120 dB in Gabtoli, Arambagh Junction, Gulshan-2 Crossing, Gulistan Crossing, Mirpur 10 Crossing, Banglamotor, New Market, Mascot Plaza of Uttara, Jagannath University and other areas.
Among the 70 points, the lowest noise level was measured at 99.6 dB during the day and 43.7 dB at night on Uttara-14 road-18. The highest noise level recorded at Farmgate was 130.2 dB during the day and the lowest was 65.7 dB at night. It has also been found that 500 to 1,000 vehicles in Dhaka honk their horns at the same time, even when stuck in traffic jams. According to the World Health Organization (WHO), about 5.0% of the world`s population suffers from noise pollution. The safety noise limit is 45 decibels (dB). Sound above 65 dB can cause heart disease, ulcers of more than 90 dB, hearing problems and changes in the nervous system, and more than 120 dB of pain in the ears and gradually destroy hearing. Workers in various occupations are exposed to more or less noise hazards every day, but workers in the ready-to-wear (RMG) industry are the biggest victims. Sustainable noise management is urgently needed to implement the fundamental concept of occupational health and safety in the workplace.
The regulations set permissible noise levels for day and night in five types of zones: quiet zones, residential areas, mixed zones, commercial areas and industrial zones. Silent areas include hospitals, educational institutions, offices and similar facilities and their surroundings of 100 meters. Silent zones are areas where noise levels must be kept lowest (50 decibels during the day and 40 decibels at night); The permissible sound level for residential areas is 55 decibels during the day and 45 decibels at night. In industrial areas where the highest noise levels are allowed, the limit is 75 decibels during the day and 70 decibels at night. According to the rules, the hours between 6 a.m. and 9 p.m. are considered daytime and the remaining hours are considered night. A separate area is prescribed for vehicle noise in Schedule 2 of the Rules, and the use of horns is completely prohibited in areas designated as quiet areas. According to the rules, the listed silent areas include hospitals, educational institutions, offices and similar facilities, as well as their surrounding area of 100 meters. The permissible sound level for residential areas is 55 decibels during the day and 45 decibels at night. The rules of procedure provide that any person who has complaints about excessive noise or breaches of the rules may address the competent authorities orally, by telephone or in writing, and specifies that officers authorized under the 1995 Act may, in accordance with the rules of procedure, enter an establishment and confiscate any noise-generating instrument.
n POOR COGNITIVE OUTCOME: Experiencing loud noises regularly reduces the ability to read, learn, and understand. Problem-solving skills and memory skills may also decrease due to frequent noise bombardment.