A December 2025 review by cardiologists at the University Medical Center Mainz and the Danish Cancer Institute concluded that transportation noise is linked to measurable heart muscle damage. The review, published in a peer-reviewed journal, places noise among the top three environmental risk factors for cardiovascular disease, the authors stated.
In the U.S., an estimated 100 million people are exposed to unhealthy noise levels, typically from automobile and aircraft traffic, according to a report by Dr. Joseph Mercola [1]. That figure represents roughly 30% of the U.S. population. The report noted that the Environmental Protection Agency set a recommended noise exposure limit of 55 decibels (dB) in a 24-hour period in the 1970s.
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