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Sonic doom: How noise pollution kills thousands each year

From heart disease to Type 2 diabetes, noise is having dire effects on people’s health. Who is most at risk and what can be done?

Shortly after I sat down to read up on the auditory and non-auditory effects of noise on health in the Lancet, the drilling began — an angry, jagged, intermittent frenzy of metal on plaster. Our downstairs neighbours have been refurbishing their flat for the past eight weeks or so, removing ceilings, party walls and any domestic contentment for us upstairs.

So, I went to a cafe. The espresso machine and staff training session I could bear. It was the three-year-old running around screaming that finally made me flee. So I went to the library. Remember when the thing about libraries was that you had to zip it? Now they play host to an everlasting Hop Little Bunnies music session. “They’re so still ... are they ill ...” Argh!

I never wanted to be the sort of person who got angry about noise. But there is something about noise that turns you into that person. One of the things that prompted our family to move from London to Bristol was our then three-year-old walking down our old road going: “It’s so noisy!” It’s not simply that noise accelerates the grumpification process. It is a pollutant, with well-established effects on multiple aspects of physical and mental health, from cardiovascular disease to depression.

“There’s consistent evidence that road traffic noise leads to heart attacks,” says Dr Yutong Samuel Cai, an epidemiologist at Imperial College London. He recently analysed the health data of 356,000 people in Britain and Norway and found that long-term exposure to traffic noise affects our blood biochemistry, over and above the effects of exhaust fumes. “Noise and air pollution usually co-exist, but we can adjust our statistical model to factor out the air pollution. Noise seems to have its own effect on the cardiovascular system.”

"There’s consistent evidence that road traffic noise leads to heart attacks" - Dr Yutong Samuel Cai

Another study, from Barts and the London School of Medicine, has linked noise pollution from road traffic to instances of Type 2 diabetes. Cai stresses that more study is needed, for example, to quantify the different health impacts of constant low-frequency noise (a motorway) and intermittent peak noise (your neighbour playing techno at 3am). “There’s relatively little study of railway noise or airport noise, for example. But it is a growing area of research at the moment.”

The World Health Organisation has calculated that at least 1 million healthy life-years are lost every year in western European countries because of environmental noise, with cardiovascular disease contributing to the vast majority of these deaths, especially high blood pressure, heart attacks and coronary heart disease. It is thought that noise triggers the release of the stress hormone cortisol, which damages blood vessels over time. Humans evolved our acute hearing millions of years ago, when we were prey animals and had to pinpoint predators, so it is no wonder we find noise stressful. It is hardwired.

A leading acoustics engineer, Trevor Cox, hypothesises that the noises we find most stressful are distress calls — screams with an unhinged roughness to them, caused by the vibrations of the vocal folds when someone is truly terrified. The frequencies are similar to the archetypal horrible sound, fingers scraping down a blackboard; and to an electric drill angrily ripping through plasterboard.

Noise exposure has also been linked with cognitive impairment and behavioural issues in children, as well as the more obvious sleep disturbance and hearing damage. The European Environment Agency blames 10,000 premature deaths, 43,000 hospital admissions and 900,000 cases of hypertension a year in Europe on noise. The most pervasive source is road-traffic noise: 125 million Europeans experience levels greater than 55 decibels — thought to be harmful to health — day, evening and night. However, airport noise and railway noise cause more complaints. Hacan, a campaign group for residents living under the Heathrow flight path, claims that 620,000 to 920,000 people are affected by noise from the airport — vastly more than for any other airport in Europe.

While epidemiologists are still quantifying the different effects of noise irritants, there are certain legal distinctions, says Tony Lewis of the Chartered Institute of Environmental Health. Ambient noise from cars and aeroplanes is in a different category from “noise nuisance” — which is defined as “an unlawful interference with a person’s use or enjoyment of land or some right over it, or in connection with it” in the 1990 Environmental Protection Act. “Road traffic by definition can’t be a noise nuisance,” he says.

Noise is subjective: people have different thresholds of what they’re able to withstand. It’s also intimately entwined with social relations. People tend to be more irritated by noises that come from unpredictable human sources (loud music, sports fans) than predictable impersonal ones (roads).

In the case of noise nuisances, people are better protected than they imagine, says Lewis. “You have the right to a reasonably quiet environment. So, you can complain to your neighbour, to the local authority or even directly to the local magistrate court.” If you make a valid complaint to the council, they are legally obliged to act — usually by issuing a noise abatement notice. “Your neighbour will then have to show what measures they have taken to abate whatever the noise is. It might be to restrict the hours of work. It might be to stop it altogether. It might be to set a noise limit. It might be to take measures to isolate one property from another. There are options. You shouldn’t have to worry about it. Give the problem to your local authority — that’s what they’re there for.”

Unsurprisingly, all of the loudest areas are in cities; it is well established that the more densely populated an area is, the more complaints there will be. Britain’s urban population is rising fast and so are their expectations. “It has a lot to do with property prices,” says David O’Neill, director of ION Acoustics in Bristol, which advises clients on how to manage noise. “If you’ve paid hundreds of thousands of pounds for a flat, you expect a certain level of quiet. Even if you’ve made the choice to buy it in the centre of town.”

Indeed, noise complaints from residents of bijou new apartment blocks are now imperilling historic music venues in many British city centres: a handful of noise complaints often spells closure. We may think we all inhabit the same space, but the number of people walking around with iPhone earbuds and noise-cancelling headphones attests to how much we’re becoming habituated to our own virtual sound-worlds.

“We’re becoming a lot more intolerant as a society,” says Lewis. “We viciously protect our own individual rights and we’re increasingly intolerant of our neighbours and the way that they live. But there’s also an increasing recognition that noise can be managed and people now expect it to be managed.”

With regards to road traffic noise, however, there are not so many options. There is no specific enforceable limit in relation to traffic noise. It is usually left to the market to sort out, in so far as houses by busy roads tend to be cheaper; it may be a pay-off you are willing to consider. “Caveat emptor — let the buyer beware — very much applies here,” says Lewis.

I head down to Eastville, a district of Bristol I occasionally zoom above at 50mph, as the M32 snakes overhead. According to Defra’s noise map , this is the loudest part of the city.

Elaine, 37, lives in one of the many houses that are divided into individual flats. “It doesn’t affect me so much, as I live at the back of the house,” she says. There’s a little garden out the back and it’s really quiet. When I came to view the property, it was a concern of mine. I have suffered with mental health in the past and the busy-ness of things can affect your thinking and be overwhelming. But I grew up next to the A1, so I’m used to it,” she says.

Clifford, 76, a retired police officer on nearby Napier Street, invites me into his house to demonstrate how much of a difference his double glazing makes. It’s almost silent. “There’s nothing you can do other than double glazing,” he says. “I don’t open my lounge windows and rarely the one in my bedroom, because I’m aware of all the rubbish coming down.” It was so hot that he had opened his bedroom window the night before. “There was this constant zum zum zum.” But to some extent, the seasons mitigate the worst effects: “When the trees are in leaf, it makes a big difference to the noise; when they’re bare, the noise comes straight across, especially at night,” he says. You don’t mind closing your windows so much in the winter. But this was an aspect of the house that Clifford factored in when he bought it.

I meet one resident, Daisy Vazquez, who is Ecuadorian and in her 30s, on her way home with a suitcase. She has lived here for a year and a half and has not managed to tune the noise out. “It’s impossible,” she says. “All the day you hear the noise.” It dies down a bit between 2am and 5am. “But the worst part is when they do roadworks at night.” She usually keeps her windows shut, but it is no fun in hot weather and even in winter the lack of ventilation causes condensation problems. She is a light sleeper and worries about the effects on her health. “It’s unpredictable. You don’t know when you are not going to sleep. And I don’t know how it would affect you longterm.”

Cai, who conducted the Imperial study into road-traffic noise and health, stresses that one compounding factor is inequality. Houses next to busy roads tend to be cheaper. The people who live in them tend to be on lower incomes and have fewer choices. And people on lower incomes tend to have more health problems. Researchers will adjust their statistical models to take account of these socioeconomic factors when considering the effects of noise. We live in a world where peace and quiet is increasingly a luxury item and noise and stress are baseline conditions for the disadvantaged.

“In the past two or three years, the links between noise pollution and mental health are becoming clearer,” says Cai. “It seems to be motivated by both sleep disturbance and noise annoyance, which varies from person to person.” He points to a 2015 German study that found that people living next to noisy roads were 25 per cent more likely to have symptoms of depression than people in quieter areas, even when adjusting for socioeconomic factors.

“We can also reasonably assume that there are particular groups that are at higher risk than others,” says Michael Eade of the campaign group Noise Nuisance . “Those people who already have fragmented sleep patterns experience heightened effects, making them more vulnerable. Such groups include the elderly, pregnant women, those already experiencing poor health and shift workers. While children have higher awakening thresholds than adults, making them less sensitive to noise, they experience a heightened effect from sleep disturbance.”


This article by Richard Godwin was originally published here via Guardian News & Media Ltd:

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