ppm
Symptoms and applicable standard
9
Maximum indoor air quality level:
Maximum allowable concentration per
ASHRAE Residential standards
62-1989 for living area.
25
Maximum limit 8 hrs of continuous
exposure per California OSHA
workplace standards.
35
Maximum 8 hrs average exposure
level per US OSHA workplace standards.
50
Maximum concentration for continuous
exposure in any 8 hrs average level per
OSHA standards.
100
Remove employees from enclosed
space if the CO concentration exceeds
100ppm per OSHA exposure limit.
40 0
Frontal headache, life threatening
after 3hrs. Maximum concentration
in flue gas per the US EPA and AGA
standards.
1600
Nausea w/i 20 min.,death w/i 2-3 hrs
20 0
Mild headache, fatigue, nausea and
dizziness w/i 2-3 hrs.
Dizziness, nausea, convulsions, death
w/i 2-3 hrs.
0-1
Normal background levels
80 0
CO LEVELS AND GUIDELINES
25