Gas measurement functions as a Technical aid and an evaluation of the concentration is only possible using a gas measurement apparatus. To ascertain the hazard potential of a gas it is necessary to measure its concentration and also to think about the length of exposure and other parameters like the sort of work being performed. Organic, ambient air is chemically a gas mixture which is composed of 78 percent nitrogen, 21 percent oxygen 0.03 percent carbon dioxide in addition to argon, helium and other rare gases in trace cent rations. Moreover there is water vapor, e. g. humidity. If the concentrations of these elements change, or a foreign gas is added, we no longer have natural air. When these changes happen, the possibility of adverse health effects exist.
The spectrum of additional so-called Air components can be extremely wide. It can vary from the pleasant fragrance of a fantastic perfume to the over powering stench of hydrogen sulfide. Likewise, the danger of every air pollutant varies substantially. The sort of substance, its concentration and duration of occurrence, in addition to probable synergistic effects with specific gas substances must all be considered. Additionally, there are lots of air pollutants which cannot be perceived by human senses as they are colorless and odorless e. g. carbon dioxide.
If the composition of the Natural air changes at all, it ought to be tested, to ascertain the substance which caused this shift. Even compounds with distinctive odors cannot be reliably assessed with the assistance of the olfactory nerve in the nose. Paper Chromatography olfactory nerve can become desensitized after a certain length of time or repeated exposure, which makes it impossible to smell even immediately dangerous concentrations. After a couple of hours we do not even perceive the pleasant fragrance of our perfume and high concentrations of hydrogen sulfide escape in the sense of smell even after a very short while.
Subjectively, one person’s feel of smell may be more sensitive to specific air pollutants than others. Oftentimes substances are noticed in very low concentrations which, even after a long-term vulnerability do not necessarily cause adverse health consequences. Generally the sense of smell is adequate in determining the presence of air pollutants, but the need exists for a goal gas analysis procedure. Gas measurement functions as a technical aid and an evaluation of the concentration is only possible using a gas measurement apparatus. To ascertain the hazard potential of a gas it is necessary to measure its concentration and also to think about the length of exposure and other parameters like the sort of work being done.