The number of possible contaminants is enormous as they can have many different origins. The building occupants themselves may be one of the most important sources, since humans naturally produce carbon dioxide (CO2), water vapor, particulate matter and biological aerosols.
(CO2), water vapor, particles, biological aerosols, while being responsible for the presence of other pollutants among which tobacco smoke itself contains more than 3,000 compounds, including carbon monoxide (CO 2), carbon monoxide (CO 2) and carbon monoxide (CO 2).
3,000 compounds, including carbon monoxide (CO), aldehydes, nitrogen oxides, metals, etc.
Odors
Some gases and vapors cause sensory discomfort due to odors and irritations that can produce anxiety and stress, especially when their sources are not identified.
Vibrations
Vibrations produced in the vicinity of a building or due to machines installed in the building can also affect
installed in the building can also have an impact. Numerous studies have been carried out on this subject, which have led to the establishment of the corresponding Standards.
Standards. (ISO 2631.1 and 2631.3-1985).
Illumination
Low illumination level, insufficient contrast, excessive brightness and glare can cause visual stress leading to eye irritation and eye pain.
can be a cause of visual stress leading to eye irritation and headaches.
headaches. Prolonged use of data display screens (DSPs) requires particularly well-designed lighting.
particularly well-designed lighting. Depending on the different visual tasks, 500-1000 lux may be recommended for office work, and 150-300
lux on the screen and 500 lux on the keyboard and documents.
Noise
Sound pressure levels should be kept within the 60-70 dB(A) limits recommended as comfortable since higher values may cause fatigue.
recommended as comfortable since higher values may cause fatigue. However, the nature of the noise is an important factor. Thus infrasound, low-frequency
low-frequency noise and pure tones can cause irritability and discomfort. ISO 1966.2-1987 refers to this problem.