Abstract
An office containing about 65 employees was found to have 8-h average CO concentrations of 18-26 ppM during a week in winter. On one Friday afternoon, 20 nonsmoking office workers had alveolar CO levels of 23 +/- 3 ppM compared to levels of 8 +/- 2 ppM in six non-smoking workers in other offices in the same building. After a weekend at home, the affected office workers displayed reduced alveolar CO levels of 7 +/- 2 ppM. The source of the high CO levels was attributed to a parking garage on the same level as the office. Closing fire doors and activating garage fans rectified the situation. The breath sampling method is found to require a correlation factor based on the difference between the true alveolar CO and the CO level in the surrounding air. The methods and equipment employed in the study (personal air monitors, electronic data loggers, breath sampling) are recommended for screening and identifying potential CO problems in buildings with similar conditions.
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