UEi Test Instruments AQM4 - Manual (Page 26)

ppm Symptoms and Applicable Standards
0-1 Normal background levels
9 Maximum indoor air quality level:
Maximum allowable concentration
per ASHRAE Residential Standards
62-1989 for living area.
25 Maximum limit 8 hours of continuous
exposure per California OSHA
workplace standards
35 Maximum 8 hours average exposure
level per US OSHA workplace
standards
50 Maximum concentration for
continuous exposure for any 8 hours
average level per OSHA standards
100 Evacuate employees from continuous
exposure in any 8 hour average level
per OSHA standards.
200 Mild headache, fatigue, nausea, and
dizziness within 2-3 hours
400 Frontal headache, life threatening
after 3 hours. Maximum
concentration in flue gas per the US
EPA and AGA standards
800 Dizziness, nausea, convulsions, death
within 2-3 hours
1600 Nausea within 20 minutes, death
within 2-3 hours.
25
CO LEVELS