Normal levels in human tissues produced by body.

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

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

1st visual display on NSI 3000 Low Level CO Monitor

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)

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

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

Maximum allowable in a Parking Garage (International Mechanical Code)

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

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

US NIOSH recommended 8 hour maximum workplace exposure. EPA standard for outdoors for 1 hour and a maximum of 1 time per year. 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

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

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

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

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)

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)

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) 800 ppm+ Death in less than one hour

EPA standard for new vehicle emissions

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

CO Levels & Risks Chart – Download the Chart