1) PEL -Permissible Exposure Limit - 8-hour time weighted averages - An employee's exposure to any substance listed, in any 8-hour work shift of a 40-hour work week, shall not exceed the 8-hour time weighted average limit given for that substance - OSHA, Occupational Safety & Health Administration
2) Human carcinogen - confirmed
3) Human carcinogen - suspected
4) Acceptable ceiling concentration
5) Simple asphyxiant
Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more.
Ammonia and health symptoms - smell and threat to life.
CO2 acceptance and comfort level.
Carbon dioxide concentration in a room may indicate air quality and ventilation system efficiency.
Exposure to Carbon Monoxide - CO and health effects.
Flame and explosion limits for gases like propane, methane, butane, acetylene and more.
Age and life expectancy for men and women.
Fresh air is required for respiration and for transport of heat and vapor emitted from the human body.
The size of dust particles, pollen, bacteria, virus and many more.
ppm - or parts per million - is commonly used as a unit of concentration.
Concentration of a pollution in a limited space as a room depends on the amount of polluted material spread in the room, supply of fresh air, outlets positions and construction, principles used for supply and outlet from the space.
It is fundamental to keep the potable water in the water supply systems uncontaminated.
Typiclal limits for impurities in drinking water.
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