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. Author manuscript; available in PMC: 2008 Apr 10.
Published in final edited form as: J Occup Environ Hyg. 2007 Nov;4(11):848–854. doi: 10.1080/15459620701643347

FIGURE 2.

FIGURE 2

CO2 levels in nonsmoking P&D trucks. Note: Y-axis scales the height of the bars so that the sum of their areas equal one. Ambient average CO2 is equal to 360 ppm and Massachusetts indoor air standard of 650 ppm.(12)