General Tools and Instruments CDM77535 - Manual (Page 11)

Type 1 Indoor areas such as department stores, theaters,
restaurants, libraries, the acceptable CO
2
concentration
of 8 hours average is 1,000ppm.
Type 2 Indoor areas with special requirements of good air
quality such as schools, hospitals, day care centers,
the suggested CO
2
level is 600ppm.
REGULATORY EXPOSURE LIMIT
ASHRAE Standard 62-1989: 1,000ppm
CO
2
concentration in occupied building should not exceed 1,000ppm.
Building Bulletin 101 (BB101): 1,500ppm
UK standards for schools say that CO
2
at averaged over the whole day
(i.e. 9:00am to 3:30pm) should not exceed 1,500ppm.
OSHA: 5,000ppm
Time weighted average over five 8-hour work days should not exceed
5,000ppm.
Germany, Japan, Australia, UK...: 5,000ppm
8 hours weighted average in occupational exposure limit is 5,000ppm.
Canada: 3,500ppm (Long Term)
ACGIH: 5,000ppm or 30,000ppm (15 min)
The American Conference of Governmental Industrial Hygienists
(ACGIH)
NOTES:
TWA: Time Weighted Average value stands for the average CO
2
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
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