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t <br /> Appendix A <br /> oxygen for the air in a confined space. As oxygen is inhaled, carbon dioxide levels build up in <br /> the confined space, with a decrease in oxygen content in the available air. This displacement of <br /> oxygen makes carbon dioxide a simple asphyxiant. At carbon dioxide levels of 3 ,00 ppm, <br /> severe headaches, diffuse sweating, and labored breathing have been reported. leo chronic <br /> health effects are reported at air levels below 5,000 pp . <br /> Air testing is one method used to determine whether carbon dioxide levels exceed the <br /> comfort levels recommended. If carbon dioxide levels are over' -l,000 ppm, the MDPH <br /> recommends adjustment of the building's ventilation system. The MD1 H recommends that <br /> corrective measures be taken at levels above Boo ppm ofcarbon dioxide in office buildings or <br /> schools. (Please rate that carbon dioxide levels measured below 800 ppm may not decrease <br /> indoor air quality complaints). Sources of environmental pollutants indoors can often induce <br /> symptoms in exposed individuals regardless ofthe adequacy f the ventilation system. As an <br /> example, an idling bus outside a building may have minimal effect on carbon dioxide levels, but <br /> can be a source of carbon monoxide,particulates and odors aria the ventilation system. <br /> Therefore, the N4DPH strategy ofadequate ventilation coupled with pollutant source <br /> reduction removal serves to improve indoor air quality in a building. Tease note that each table <br /> included in the IAQ assessment lists BEH comfort levels for carbon dioxide levels at the bottom <br /> i.e. carbon dioxide levels between boo ppm to 800 ppm are acceptable and<600 ppm is <br /> preferable). while carbon dioxide levels are important, focusing on these air measurements in <br /> isolation to all other recommendations is a misinterpretation of the reco rnendations made in <br /> these assessments. <br /> Appendix A, page <br />