CO Level

Action

1-4ppm

Normal levels in human tissues produced by body.

3-7ppm

14% increase in the rate of admission in hospitals of non-elderly for asthma. (Sheppard-1999)

5-6ppm

Significant risk of low birth rate if exposed during last trimester (Ritz & Yu-1999)

5ppm

1st visual display on NSI 3000 Low Level CO Monitor

9ppm

ASHRAE standard for allowable spillage from vented appliances, indoors, for 8 hours exposure daily. EPA standard for outdoors for 8 hours and a maximum 3 times per year. (Clean Air Act)

10ppm

Outdoor level of CO found associated with a significant increase in heart disease deaths and hospital admissions for congestive heart failure. (JAMA, Penny) lst ambient level occupants should be notified-NCI Protocol

15-20ppm

First level World Health Organization lists as causing impaired performance, decrease in exercise time and vigilance 1st Alarm level for NSI 3000 Low Level CO Monitor-5 minutes

25ppm

Maximum allowable in a Parking Garage (International Mechanical Code)

27ppm

21% increase in cardio respiratory complaints (Kurt-1978)

30ppm

Earliest onset of exercise induced angina (World Health Organization) 1st visual display on UL2034 approved CO Alarm-Must not alarm before 30 days

35ppm

US NIOSH recommended 8 hour maximum workplace exposure EPA standard for outdoors for 1 hour and a maximum of 1 time per year Level many fire departments wear breathing apparatus before entering 2nd ambient level occupants should be notified and space ventilated 2nd Alarm level for NSI 3000 Low Level Monitor-5 minutes

 

CO Level

Action

50ppm

US OSHA recommended 8 hour maximum workplace exposure Maximum NCI level for Unvented appliances

70ppm

1st Alarm level of UL2034 approved CO Alarms- 2-4 hours 3rd Alarm level for NSI 3000 - 30 seconds NSI 3000 Low Level Monitor cannot be silenced by reset button

100ppm

Maximum NCI CO level during run cycle in all vented appliances(stable) Maximum NCI CO for all oil appliances

200ppm

First listed level(established in 1930) healthy adults will have symptoms-headaches, nausea NIOSH & OSHA recommend evacuation of workplace Maximum “Air Free” CO for vented water heater and unvented heaters (ANSI Z21) UL approved alarms must sound between 30 – 60 minutes(NSI 3000 – 30 seconds)

400ppm

Healthy adults will have headaches within 1-2 hours. Life threatening after 3 hours Maximum “Air Free” CO in all vented heating appliances (ANSI Z21) Maximum EPA levels for industrial flue exhaust UL Alarms must alarm within 15 minutes (NSI 3000 – 30 seconds) Maximum recommended light-off CO for all appliances – NCI (except oil)

800ppm

Healthy adults will have nausea, dizziness, convulsions within 45 minutes. Unconscious within 2 hours then Death(established in 1930) Maximum “Air Free” CO for unvented gas ovens (ANSI Z21) 800ppm+ Death in less than one hour

2000ppm

EPA standard for new vehicle emissions

3000ppm+

Typical emissions from propane lift trucks, gasoline powered tools etc. Death in less than 30 minutes.