Carbon Monoxide Exposure Refer to Exercise. High concentrations of carbon monoxide (CO) ca...

Carbon Monoxide Exposure Refer to Exercise. High concentrations of carbon monoxide (CO) can cause coma and death. The time required for a person to reach a COHb level capable of causing a coma can be approximated by the quadratic model

where T is the exposure time in hours necessary to reach this level and is the amount of carbon monoxide present in the air in parts per million (ppm). (Source: Indoor Air Quality Environmental Information Handbook: Combustion Sources, Report No. DOE/EV/10450-1, U.S. Department of Energy, 1985.)

(a) What is the exposure time when  ppm?

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(b) Estimate the concentration of CO necessary to produce a coma in 4 hr.