These are the noisiest cities in the world and so are affecting its inhabitants

The noisiest cities in the world
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High noise levels have a negative impact on our health. Some of the problems associated with long exposure to high decibel level are hearing impairment, hypertension, ischemic heart disease, stress, behavioral disorders, sleep disturbance or decreased school performance, and most were identified in the 60s.

To a greater or lesser extent, we are all exposed to certain levels of noise that can affect us in some way or another when they exceed certain limits. Some of these sound are very evident and others, depending on the frequency at which they operate, not so much. However, these add up to the total decibel level in our environment and in some cities in the world the problem can be quite difficult to solve.

Mapping the noise and its effects

Erica Walker is doing a doctorate at Harvard TH Chan School of Public Health for who has spent the last year riding a bicycle between Cambridge, Boston and Somerville (Massachusetts) with a sound level meter in tow, to measure the decibel level existing in different parts of each city.

In parallel, Walker is collecting information on the impact that noise pollution has on the inhabitants of these areas through an online questionnaire. Her idea is to analyze more than 900 surveys and 400 decibel readings to assign a sound value to homes individually.

With the results in her hands, Walker plans to draw a comparison between the noise perceived by people and real noise pollution in a handful of neighborhoods. However, not only that, but from all that data you want to compare the noise levels with certain health problems to try to establish possible patterns of cause and effect.

One of the things that Walker has discovered is that low-frequency noise could be the most damaging: the sound of the subway beneath our feet, a plane taking off or engine of a bus would be good examples. Coincidentally these noises are those often ignored in studies related to the topic, which usually focus on those located in the middle strip that everyone could hear.

Most of the problems associated with long exposure to high decibel level were identified in the mid-twentieth century, but what I want to get Walker with her particular sound map is to know the differences between noise perception by the people and reality, establish health problems related patterns and, above all, that mention the noise in relation to public health again. If successful, it could replicate the study in more cities to try to make them quieter?

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The noisiest cities in the world

Given this, we wanted to see what are the noisiest cities in the world…

10. Karachi (Pakistan)

Karachi has a population of over 15 million inhabitants and its traffic is insane: more than 5 million vehicles travel through its streets daily.

09. Shanghai (China)

The largest city in China thanks to its more than 24 million people could not stay out of a ranking like this. Each year about 100,000 complaints caused by noise and there is a law which prohibits loud reforms at home during holidays in schedule of 18: 00h to 08: 00h.

08. Buenos Aires (Argentina)

The capital of Argentina is the noisiest city in Latin America. Its metallurgical tradition linked to increased construction and the number of vehicles on its streets has earned that dubious honor.

07. New York (United States)

It makes sense in the case of the largest city in North America, where more than 8.4 million people reside. This figure, as with any other major city, all the people that travels throughout the year for tourism must be added. Taxis, construction, nightclubs … noise sources in New York are countless and constant.

06. Madrid (Spain)

Despite having only about 3.2 million people, one far removed from those more than 8 million people living in New York figure, Madrid is considered one of the noisiest cities in the world. In this country the noise limits are set at 65 dB during the day and 55dB at night. According to the study, 15% of the population of Madrid is exposed to noises whose values ​​exceed the limits of day, while at night this figure rises to 20% due to the bars and nightclubs (there are areas that the decibel level reaches the 75dB at night).

05. Tokyo (Japan)

In the case of Tokyo, unlike other cities where one of the main sources of noise is traffic, the problem is in construction, followed by public address messages, factories and commercial activity.

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04. Delhi (India)

According to a article, a survey collected in 2013 that the inhabitants of Delhi took a decade complaining of hearing loss at age 60, when this type of degeneration caused by age should not appear until you have completed 75 years. The researchers concluded that the main cause of this problem was the extremely high noise of the city, where you can easily reach 85dB of continuously and peaks up to 93dB in some industrial areas.

03. Cairo (Egypt)

In Cairo, they have a serious problem with the noise level. The average is at 90dB at 7:30h in the morning and generally never drop 70dB when it would be acceptable between 33dB and 55dB. To this must be added the fact that industrial zones are not separated from residential, so people who spend many hours on the street, such as the police, are prone to stress and any effect arising from high levels of noise.

02. Calcutta (India)

The combination of large factories and the use of firecrackers in festivities make at certain times of year the noise level exceeds 100dB in Calcutta.

01. Bombay (India)

Bombay is one of the most populated cities in the world and is considered the noisiest. Its huge population and the amount of traffic flowing through its streets, plus all the shopping and entertainment, make the 100dB are exceeded.

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