A new study of the world’s loudest noise levels found that for nearly two decades, the world has been living at a loud noise level that was only just above the global average.
The study, published Monday in the journal Nature Communications, also found that there has been no significant increase in ambient noise pollution since the turn of the century.
“The noise that we’ve heard in the past two decades has been really loud and very unpleasant,” said lead author James P. Anderson, a senior scientist at the University of Maryland, Baltimore County, who is a professor of atmospheric sciences at the school.
“This means we’ve had a long time in which noise pollution has been so pervasive and so widespread that it’s no longer a surprise to anyone that we live in a noisy world.”
In the early 1980s, the average world noise level was less than a quarter of the level of the 20th century.
That is when, according to the study, we began hearing the first sound from the human race: the hum of the airplane engines on takeoff.
Today, that hum can be heard at least 30 miles away.
That noise is so loud, that even the slightest change in the ambient temperature can trigger a spike in the level.
It can also be heard by people sitting on a crowded subway platform, or a family of three who are sitting on the porch of a house.
“It’s been so ubiquitous that people have taken to ignoring it and ignoring it,” Anderson said.
“And people have been paying more attention to it and paying more serious attention to how loud it is.”
At the beginning of the 21st century, scientists noticed that there was a clear increase in the noise level around the world.
In the United States, noise levels peaked in the early 1990s and fell in the late 2000s.
Since then, they have been increasing around the globe.
The researchers analyzed the levels of air pollution from cars, trains, and other vehicles in the United Kingdom and the United Arab Emirates, and compared them to the noise levels recorded in New York City during the 1970s and 1980s.
“We’re seeing the effects of the rapid development of urbanization,” Anderson told The Associated Press.
“New York City is an urban environment with very high levels of pollution.”
Anderson and his colleagues used a sophisticated computer model to compare the noise to that of an aircraft.
“If you look at the noise and the speed of the aircraft, it’s actually much more similar to the ambient noise that the average person hears on the street than it is to the sound of airplanes,” Anderson explained.
“In terms of the actual noise, we’re talking about a relatively small difference, which is not that much, but that’s what makes this difference important.”
For example, during the late 1990s, air pollution levels in the U.K. were as much as 16 times higher than in New England.
The average noise level in the world today is about 15 to 25 decibels, or 10 decibell to 40 decibelle, according the study.
The difference in noise levels in New Orleans and New York could be a factor in the increase in noise in New Zealand.
“People don’t think about the noise in a lot of places,” Anderson added.
“But the noise that they hear in New Zelanders and New Yorkers is quite different from the noise they hear on the streets in New Mexico.”
The scientists found that the world continues to live at a noisy noise level even today.
The United States has been the world leader in noise pollution for nearly three decades.
The world’s noise levels reached an average of 24 decibel in 2015.
The highest recorded level was 23 decibela in New Jersey, in 1997.
In 2014, the U and U.S. also had the highest average noise levels for the year, at 35 decibelo.
“Our model shows that even if the noise continues to increase, it won’t make much difference in the long term,” Anderson noted.
“A world without air pollution is an unpleasant place to be.”
This study has important implications for public health, the environment, and energy efficiency, according in part to the researchers.
For instance, it shows that the noise emitted by vehicles has increased by more than 200 times over the past 30 years, but has actually decreased by less than one percent.
That suggests that the public has been getting a false sense of security that the air quality in their city is better than the noise.
The authors also note that noise is not necessarily an indicator of pollution.
For example the study found that in countries with higher levels of urban noise pollution, there are fewer traffic fatalities and less crime.
“There is a clear correlation between pollution and reduced life expectancy and reduced crime,” the researchers said in a statement.
“Even in the countries that have a lower noise level than the world average, there is evidence that there is an inverse relationship between pollution levels and crime.
It’s not just a matter of