30/03/2021
NOISE POLLUTION IN THE PHILIPPINES
PART 2 -NOISE DECIBELS
Estimated Reading Time: 7 min
Eagan J. Bright | September 04, 2020 Managing Editor, Simon's News Media Productions
• Environmental Noise Pollution -Philippines
• AWE International -Philippines
• Village Green Global – California
Noise pollution is an invisible danger. It cannot be seen, but it is present nonetheless, both on land and under the sea. Noise pollution is considered to be any unwanted or disturbing sound that affects the health and well-being of humans and other organisms.
Sound is measured in decibels. There are many sounds in the environment, from rustling leaves (20 to 30 decibels) to a thunderclap (120 decibels) to the wail of a siren (120 to 140 decibels). Sounds that reach 85 decibels or higher can harm a person’s ears. Sound sources that exceed this threshold include familiar things, such as power lawn mowers (90 decibels), subway trains (90 to 115 decibels), and loud rock concerts (110 to 120 decibels).
Noise pollution impacts millions of people on a daily basis. The most common health problem it causes is Noise Induced Hearing Loss (NIHL). Exposure to loud noise can also cause high blood pressure, heart disease, sleep disturbances, and stress. These health problems can affect all age groups, especially children. Many children who live near noisy airports or streets have been found to suffer from stress and other problems, such as impairments in memory, attention level, and reading skill.
Noise pollution also impacts the health and well-being of wildlife. Studies have shown that loud noises cause caterpillars’ hearts to beat faster and bluebirds to have fewer chicks. Animals use sound for a variety of reasons, including to navigate, find food, attract mates, and avoid predators. Noise pollution makes it difficult for them to accomplish these tasks, which affects their ability to survive.
Increasing noise is not only affecting animals on land, it is also a growing problem for those that live in the ocean. Ships, oil drills, sonar devices, and seismic tests have made the once tranquil marine environment loud and chaotic. Whales and dolphins are particularly impacted by noise pollution. These marine mammals rely on echolocation to communicate, navigate, feed, and find mates, and excess noise interferes with their ability to effectively echolocate.
Some of the loudest underwater noise comes from naval sonar devices. Sonar, like echolocation, works by sending pulses of sound down into the depths of the ocean to bounce off an object and return an echo to the ship, which indicates a location for object. Sonar sounds can be as loud as 235 decibels and travel hundreds of miles under water, interfering with whales’ ability to use echolocation. Research has shown that sonar can cause mass strandings of whales on beaches and alter the feeding behavior of endangered blue whales (Balaenoptera musculus). Environmental groups are urging some developed countries like the U.S. Navy to stop or reduce using sonar for military training.
Seismic surveys also produce loud blasts of sound within the ocean. Ships looking for deep-sea oil or gas deposits tow devices called air guns and shoot pulses of sound down to the ocean floor. The sound blasts can damage the ears of marine animals and cause serious injury. Scientists believe this noise may also be contributing to the altered behavior of whales.
Among those researching the effects of noise pollution is Michel Andre, a bioacoustics researcher in Spain who is recording ocean sounds using instruments called hydrophones. His project, LIDO (Listening to the Deep Ocean Environment), collects data at 22 different locations. Back in the lab, computers identify the sounds of human activities as well as 26 species of whales and dolphins. The analysis aims to determine the effects that underwater noise is having on these animals. Andre hopes his project will find ways to protect marine animals from the dangers of ocean noise.
Noise pollution: how to reduce the impact of an invisible threat?
Atmospheric pollution is not the only type of contamination that is harming living beings on the planet. According to the World Health Organization (WHO), it is one of the most dangerous environmental threats to health. And according to the European Environment Agency (EEA), noise is responsible for 16,600 premature deaths and more than 72,000 hospitalizations every year in Europe alone.
According to the WHO, noise is harmful when it exceeds 75 decibels (dB) and feels painful at levels above 120 dB. Drivers honking the horn, groups of workers drilling the road surface, aircraft flying over us in the sky... Noise, noise and more noise. Cities have become the epicenter of a type of pollution, acoustics, which, although its invisibility and the fact that coronavirus crisis reduced it until almost yearn it, is severely damaging to human beings.
Not only does it hurt humans, it is bad for animals, too. According to the National Park Service (NPS) in the United States, noise pollution has an enormous environmental impact and does serious damage to wildlife. Experts say noise pollution can interfere with breeding cycles and rearing and is even hastening the extinction of some species.
WHAT IS NOISE POLLUTION?
Not all sound is considered noise pollution. The World Health Organization (WHO) defines noise above 65 decibels (dB) as noise pollution. To be precise, noise becomes harmful when it exceeds 75 decibels (dB) and is painful above 120 dB. As a consequence, it is recommended noise levels be kept below 65 dB during the day and indicates that restful sleep is impossible with nighttime ambient noise levels in excess of 30 dB.
CAUSES OF NOISE POLLUTION
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. For example, a car horn produces 90 dB and a bus produces 100 dB.
Air traffic noise
There are fewer aircraft flying over cities than there are cars on the roads, but the impact is greater: a single aircraft produces 130 dB.
Construction sites
Building and car park construction and road and pavement resurfacing works are very noisy. For example, a pneumatic drill produces 110 dB.
Catering and night life
Bars, restaurants and terraces that spill outside when the weather is good can produce more than 100 dB. This includes noise from pubs and clubs.
Animals
Noise made by animals can go unnoticed, but a crowing rooster,howling or barking dog, for example, can produce around 60-80 dB.
Produced by World Hearing and WHO and SNTEF-2018, Mini Hearing Technologies GMBH
EFFECTS OF NOISE POLLUTION
As well as damaging our hearing by causing — tinnitus or deafness —, constant loud noise can damage human health in many ways, particularly in the very young and the very old. Here are some of the main ones:
Physical
Respiratory agitation, racing pulse, high blood pressure, headaches and, in case of extremely loud, constant noise, gastritis, colitis and even heart attacks.
Psychological
Noise can cause attacks of stress, fatigue, depression, anxiety and hysteria in both humans and animals.
Sleep and behavioral disorders
Noise above 45 dB stops you from falling asleep or sleeping properly. Remember that according to the World Health Organization it should be no more than 30 dB. Loud noise can have latent effects on our behavior, causing aggressive behavior and irritability.
Memory and concentration
Noise may affect people's ability to focus, which can lead to low performance over time. It is also bad for the memory, making it hard to study.
Interestingly, our ears need more than 16 hours' rest to make up for two hours of exposure to 100 dB.
SOLUTIONS TO REDUCE NOISE POLLUTION
International bodies like the WHO agree that awareness of noise pollution is essential to beat this invisible enemy. For example:
Avoid very noisy leisure activities,
Opt for alternatives means of transport such as bicycles or electric vehicles over taking the car.
Do your housework at recommended times.
Insulate homes with noise-absorbing materials.
Educating the younger generation is also an essential aspect of environmental education.
Governments can also take measures to ensure correct noise management and reduce noise pollution. For example:
Protecting certain areas — parts of the countryside, areas of natural interest, city parks, etc. — from noise,
Establishing regulations that include preventive and corrective measures
Mandatory separation between residential zones and sources of noise like airports, fines for exceeding noise limits, etc. —,
Installing noise insulation in new buildings, creating pedestrian areas where traffic is only allowed to enter to offload goods at certain times,
Replacing traditional asphalt with more efficient options that can reduce traffic noise by up to 3 dB, among others.