Noise Can Affect Our Health! Let’s Check Its Standards, Classification, and Sources

The term *noise* encompasses all detrimental, bothersome, discomfort-inducing, and undesired acoustic waves that impact not merely our auditory system but also our remaining sensory modalities and physiological systems. It has evolved into an inescapable—and regrettably ever-more-ubiquitous—byproduct of contemporary civilization, persistently eroding the quality of life for individuals and communities alike. Functioning as a veritable "modern-day scourge," its repercussions extend beyond human health to disrupt ecological equilibrium, triggering long-term, frequently irreversible alterations within natural environments.

Acoustic phenomena, specifically sound, exhibit considerable diversity in terms of perception and environmental impact. While sound waves are ubiquitous in daily life, only specific parameters classify them as noise—a potentially harmful factor to human health. These parameters primarily include **intensity** (measured in decibels as sound pressure level) and **frequency** (the number of oscillations per second, expressed in hertz). The human auditory system is capable of detecting sound waves within the range of **16 Hz to 20,000 Hz**, commonly referred to as the **audible frequency spectrum**. Waves with frequencies below 16 Hz are categorized as **infrasound**, characterized by exceptionally long wavelengths that enable propagation over vast distances with minimal attenuation. Sources of infrasound are divided into **natural** (e.g., seismic activity, volcanic eruptions, atmospheric turbulence, waterfalls, ocean wave breakers along coastlines, strong winds) and **anthropogenic** (transportation infrastructure, heavily trafficked bridges, pipeline systems, industrial furnaces, rocket launch pads, vacuum pumps, or low-frequency speakers). Exposure to infrasound may lead to **physiological disruptions**, including general malaise, fatigue, and even sleep disturbances. Another distinct category is **ultrasonic noise**, encompassing frequency components ranging from **10 kHz to 100 kHz**—extending beyond the upper threshold of human hearing. Ultrasound waves are defined by **short wavelengths** and **substantial attenuation in air**; however, their impact on the human body can be significant, as they penetrate not only through the auditory system but also via the **skin surface**, potentially causing tissue damage. The primary environments generating this type of noise are **industrial workplaces**, where devices emitting ultrasound—such as **welding machines, soldering irons, milling machines, grinders, circular saws, or pneumatic tools**—are routinely operated. It is critical to emphasize that contemporary urban and industrial environments are **heavily burdened by noise emissions**, with the most disruptive types being **traffic noise (road and rail), aviation noise, industrial noise, and noise from large-scale public events**. This issue predominantly affects **urban residents** due to proximity to transportation infrastructure and high vehicle traffic density, as well as **workers subjected to prolonged exposure to industrial noise**.

The absolute threshold of human hearing stands at 0 decibels, yet the health implications of sound exposure are contingent upon both its intensity and duration. Auditory stimuli that pose no risk to well-being should remain below 35 dB; this category encompasses ambient natural sounds—such as the rustling of grass, gentle airflow, or the subtle whisper of leaves—which do not constitute harmful noise. However, even at levels as low as 45–50 dB, highly sensitive individuals may experience initial discomfort, including impaired concentration or heightened irritability, while the 50–70 dB range correlates with chronic fatigue, sleep disturbances, and elevated anxiety. Exposure to 80–90 dB not only diminishes cognitive and physical performance but may also elicit aggressive behaviors and exacerbate interpersonal conflicts. Noise exceeding 100 dB presents a tangible threat to auditory structure due to excessive acoustic pressure, which, if sustained, leads to permanent damage. Of particular concern is the use of headphones at volumes reaching up to 115 dB—a practice that carries a substantial risk of irreversible hearing loss. The 130 dB threshold marks the pain limit, comparable to the sound of a jet engine at takeoff, whereas levels above 150 dB inflict severe, irreversible auditory damage; at 160 dB, rupture of the eardrum becomes probable. Extreme intensities, such as 185 dB (e.g., during a rocket launch), trigger abrupt blood pressure spikes, and at approximately 200 dB, arterial embolism with fatal outcomes may occur. Prolonged exposure to even moderate noise levels entails serious health consequences—both physiological and psychological—including cardiovascular dysfunction, neurological disorders, metabolic imbalances, impaired vision, and thermoregulatory disturbances. Infrasound exposure may manifest as chronic fatigue, anxiety, nausea, headaches, skin paresthesia, coughing, cardiac arrhythmias, hypotension, or tachypnea. Ultrasound, conversely, directly damages the vestibular apparatus within the inner ear, with extrasensory effects encompassing circulatory impairments, neurological deficits, metabolic dysregulation, and endocrine gland malfunctions (e.g., thyroid or gonadal disorders). While complete noise eradication from daily life remains unfeasible, effective mitigation strategies exist at both systemic (legal regulations, protective infrastructure) and individual levels (routine hearing assessments, avoidance of high-noise environments, relaxation techniques).