Articles Fine vs.Coarse Air Filtration Media Atmospheric Air Sick Building Syndrome     The Air We Breathe Air is a mixture of gases composed of approximately 21% oxygen,     78% nitrogen, 1% argon, and traces of other gases.   The air we breathe also includes particulate material and gases     generated by nature, by man, or by industrial processes.   We should be most concerned with particulate matter that influences     our health and comfort.     Because we spend 90% of our time indoors, indoor air quality     awareness is becoming more of an issue.     Importance of Air Filtration For the protection of people For the protection of processes and equipment For the protection of the environment   Principles of Air Filtration Impingement Interception Straining