I ndoor air quality problems are generally handled on a trial and error basis, using the most logical approach first, rather than attempting to determine the exact identity of the contaminant. 7.2 Noise N oise is simply defined as unwanted sound. At high enough levels, noise can present a hazard by causing temporary or permanent hearing loss. At lower levels, noise may not necessarily be hazardous, but may be irritating or may cause discomfort. Most indoor noise sources in offices and classrooms are not loud enough to cause hearing impairment.
T here are a variety of methods for controlling or reducing noise levels in indoor environments.
The most obvious choice is to eliminate the source of the noise. If this is not feasible, it might be possible to move the source of noise to an area where it will not cause a problem. If it is impossible to separate people from the noise source, it may be possible to isolate the noise source or dampen the sound, or as a last resort provide personal protective equipment. 7.3 Lighting T he quantity, quality and distribution of illumination plays an important role in the overall indoor environment. Deficient lighting can cause headaches and eye fatigue.