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Table 1 Air Quality Guidelines for Europe, Second Edition published by the World Health Organisation (WHO) state that a carboxyhemoglobin (COHb) level of 2.5% should not be exceeded as determined in ambient carbon monoxide (CO) concentrations after a given exposure period

From: Prevalence of hidden carbon monoxide poisoning in auto service workers; a prospective cohort study

CO concentration (mg/m3) CO concentration(ppm) Exposure Time (Minute)
100 90 15
60 50 30
30 25 60
10 10 480