Amprobe CO2-200 CO2-Meter - Manual (Page 17)

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APPENDIX - CO2 LEVELS AND GUIDELINES
NIOSH recommendations
250-350 ppm: normal outdoor ambient concentrations
600 ppm: minimal air quality complaints
600-1000 ppm: less clearly interpreted
1000 ppm: indicates inadequate ventilation; complaints
such as headaches, fatigue, and eye/throat irritation will
be more widespread. 1000 ppm should be used as an
upper limit for indoor levels.
ASHRAE Standard 62-1989: 1000ppm
CO2 concentration in occupied building should not
exceed 1000ppm.
Building bulletin 101 (BB101): 1500ppm
UK standards for schools say that CO2 at averaged over
the whole day(i.e. 9am to 3.30pm) should not exceed
1500ppm.
OSHA: 5000ppm
Time weighted average over five 8-hour work days
should not exceed 5000ppm.
Germany, Japan, Australia, UK: 5000ppm
8 hours weighted average in occupational exposure limit
is 5000ppm.