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Different noise levels are classified into five categories based on decibel levels. The highest category, painful, can cause permanent hearing loss, and protective equipment is necessary in such situations.
Noise level is generally defined as the amplitude of various sounds occurring within a given area. In order to accurately measure the noise levels generated under specific circumstances, various sounds are evaluated and the so-called decibel level assigned. Categorizing the noise level into different classes allows you to determine the potential for damage to your ears, as well as providing useful information in choosing ear protection for those who will be in the area for an extended period of time.
The typical noise level graph classifies various sounds into five different categories. The first class is generally known as low noise levels and usually carries a range of no more than 30 decibels. These are considered completely safe and pose no threat to your ears. An example of a weak level would be a whispered exchange in a public library.
A second classification of acoustic noise level is known as moderate class. Like the soft category, even moderate noises pose no threat to the human ear and are common. This noise level is usually between 40 and 50 decibels, it is often pleasant and ideal for helping someone relax. Constant rain or a more or less silent room are examples of a moderate sound level.
Third class is known as very noisy. This class usually involves a range of 60 to 80 decibels. However, noises of this type are still considered acceptable and pose no real threat to hearing ability. Typical street noise in a medium-sized city is an example of very loud noise, such as an alarm clock ringing or a vacuum cleaner running.
Extremely high noise level includes noises that have some potential to cause damage to the ear and ranges from 90 to 110 decibels. For example, noisy machinery in a manufacturing plant can cause hearing loss unless earplugs are used to muffle the sounds. Tools like a chainsaw or large drills can also make noises loud enough to cause damage, if exposure is ongoing.
The most severe type of noise level is usually known as painful. This category is for noises that register over 120 decibels. Sounds in this category are capable of causing temporary or even permanent hearing loss in one or both ears. The classic example of an event that creates sound at this level is a rock and roll concert. Along with loud music, proximity to a jet engine starting for takeoff, an air raid siren, or a jackhammer in use on a construction site are also good examples of noise levels that can cause hearing loss .
In many situations where people are exposed to extremely loud or painful noise levels, the use of protective equipment is considered absolutely necessary. Depending on the particular noise level, an individual may be required to wear simple ear plugs that muffle the sound sufficiently to protect the ears. In more serious situations, hearing protection may be needed that not only protects the ear canal but also includes the outside of the ear to prevent any type of hearing damage.
