Understanding Carbon Monoxide Levels: A Step-by-Step Guide

Carbon monoxide (CO) is a colorless, odorless gas produced by the incomplete combustion of fuels like natural gas, coal, wood, and gasoline. It's commonly emitted by unvented gas space heaters, gas stoves, fireplaces, generators, and gasoline-powered equipment. Understanding CO levels is crucial for health and safety.

What Are Normal Carbon Monoxide Levels?

In homes without gas stoves, typical CO levels range from 0.5 to 5 parts per million (ppm). With gas stoves, levels can be between 5 and 15 ppm. Prolonged exposure to levels between 1 and 70 ppm usually doesn't cause symptoms in healthy individuals. However, concentrations above 70 ppm can lead to symptoms of CO poisoning. (colorado.edu)

How Do Carbon Monoxide Levels Affect Health?

CO binds with hemoglobin in the blood, forming carboxyhemoglobin (COHb), which reduces oxygen delivery to tissues. This can lead to symptoms such as headaches, dizziness, confusion, and, at higher concentrations, unconsciousness or death. (scienceinsights.org)

What Are Dangerous Carbon Monoxide Levels?

• 50 ppm: The maximum level allowed for an 8-hour workday. Healthy adults may not notice symptoms, but prolonged exposure isn't safe for those with heart disease.

• 200 ppm: Headache, dizziness, and nausea can develop within two to three hours.

• 400 ppm: Headache becomes severe within one to two hours; life-threatening after three hours.

• 800 ppm: Dizziness, nausea, and convulsions can appear within 45 minutes; unconsciousness and death possible within two to three hours.

• 1,500 to 2,000 ppm: Dangerous after one hour of exposure.

• 6,400 ppm and above: Can be fatal within 15 to 30 minutes. (scienceinsights.org)

How Are Carbon Monoxide Levels Measured?

CO levels are measured in parts per million (ppm). Carbon monoxide detectors are time-weighted alarms, meaning they measure the buildup of CO over time. Standard detectors typically don't alarm at levels below 30 ppm, but ultra-sensitive detectors can indicate lower levels, which may have health implications for those with pre-existing conditions. (kidde.com)

What Should You Do If Carbon Monoxide Levels Are Elevated?

If your CO alarm sounds or you suspect elevated CO levels, immediately leave the area and call emergency services. Do not re-enter until the source is identified and the area is deemed safe. (kidde.com)

Understanding carbon monoxide levels and their effects is vital for health and safety. Regular maintenance of combustion appliances and proper ventilation can help prevent dangerous CO buildup.