Sper Scientific 800046 Indoor Air Quality Meter - Manual (Page 18)

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CO
2
LEVELS AND GUIDELINES
The following are excerpts from ANSI/ASHRAE addendum
standard 62.1-2004:
Enforceable and/or Regulatory Levels:
OSHA – The Occupational Safety and Health
Administration
5,000ppm
MAK – German Institution
5,000ppm or 10,000ppm (1h)
Non-Enforced Guidelines and Reference Levels:
Canadian – 3500ppm (Long-term)
NIOSH – The United States National Institutes of Health
5,000ppm or 30,000ppm (15 min)
ACGIH – 5,000ppm or 30,000ppm (15 min)
The American Conference of Government Industrial
Hygienists (ACGIH)
Note...
TWA (Time Weighted Average) stands for the average
carbon dioxide level exposure during 8 hours (working day)
is 5,000ppm/5 days.
STEL (Short-Term Exposure Limit) value shows the last 15
minutes CO
2
concentration is 30,000ppm.
ASHARE – Standard 62 – 1989, Sec.6.1.3: Comfort (odor)
criteria are likely to be satisfied if the ventilation rate is set
so that 1,000ppm of CO
2
is not exceeded.