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CO2 LEVELS AND GUIDELINES
The following are excerpts from
ANSI/ASHRAE addendum standard
62.1-2004:
Enforceable and/or regulatory levels:
OSHA -5000ppm
The Occupational Safety and Health
Administration
MAK -5000ppm or 10000ppm(1h)
German institution
Non-Enforced Guidelines and Reference
levels:
Canadian - 3500ppm (Long-term)
NIOSH-5000ppm or 30000ppm(15 min)
The U.S.National Institutes of Health
ACGIH-5000ppm or 30000ppm(15min)
The American Conference of Govern-
mental Industrial Hygienists (ACGIH)
NOTES :
TWA(Time Weighted Average) value
stands for the average carbon dioxide
level exposure during 8 hours(working
day) is 5000ppm/5 days.
STEL(Short-Term Exposure Limit)
value shows the last 15 minutes CO2
concentration is 30,000ppm.
ASHARE Standard 621989,Sec.6.1.3
:Comfort (odor) criteria are likely to be
satisfied if the ventilation rate is set so
that 1,000 ppm of CO2 is not exceeded.
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