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https://vedard.com/blog/what-kind-of-carbon-monoxide-detector-co-alarm-should-you-choose

Source: vedardalarm.com

Date: 2025/12/17

Incomplete combustion of carbon-based fuels such as wood, charcoal, gasoline, kerosene, alcohol, and methane produces carbon monoxide. Carbon monoxide (CO) is lighter than air, and inhaling it can lead to poisoning. Carbon dioxide (CO2) is heavier than air; while humans inhale oxygen and exhale carbon dioxide, high concentrations of carbon dioxide are also harmful to health.
The most common cause of carbon monoxide poisoning is idling in a car with the air conditioning on. When the car is stationary, the engine takes in less oxygen, which leads to incomplete combustion of gasoline and the production of carbon monoxide. If a person is resting or sleeping in the car, they are very likely to suffer from carbon monoxide poisoning. There have been many news reports of such poisoning incidents, and the consequences are very serious.
The February 2019 issue of *Health and Life* magazine reported on a case of Ms. Li, a resident of Liuyang, who suffered carbon monoxide poisoning after using a closed room for heating. At the time, Ms. Li only experienced mild symptoms such as dizziness and nausea, so she did not seek any treatment. Unexpectedly, two weeks later, Ms. Li suddenly developed symptoms including incontinence, inability to speak, impaired limb movement, and slowed reflexes. She was taken to the hospital and diagnosed with delayed encephalopathy due to carbon monoxide poisoning. In fact, similar cases are common, so even if mild symptoms of carbon monoxide poisoning occur, it is necessary to immediately stop your travel and seek medical attention at a hospital. However, if you are heating yourself in a confined space without proper ventilation, the concentration of carbon monoxide gas can rise, posing a danger.
If a fire is lit for warmth in a poorly ventilated environment, carbon dioxide levels will slowly rise. Symptoms in this environment mainly include headaches, dizziness, difficulty concentrating, and memory loss. During the day, when a person is awake, they will feel uncomfortable and naturally go outside to breathe fresh air, so there shouldn’t be a problem. However, it’s important to note that if a person uses a heater at night while sleeping, excessively high carbon dioxide levels can be life-threatening.

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A carbon monoxide concentration below 50 PPM is considered safe. If it exceeds this level, it can have adverse effects on health, and immediate ventilation is necessary. To better monitor carbon monoxide levels, it is strongly recommended that people carry a carbon monoxide detector. Of course, a combined carbon monoxide and carbon dioxide detector would be even better.
While there are many carbon monoxide alarms on the market, they are mainly used in kitchens. Carbon monoxide sensors are divided into two types: electrochemical sensors and semiconductor sensors. Electrochemical sensors are more expensive but offer higher accuracy and better real-time performance; semiconductor sensors are cheaper but less accurate. Therefore, carbon monoxide alarms used for outdoor camping etc. should ideally employ high-precision electrochemical sensors for better sensitivity. However, most current carbon monoxide alarms use semiconductor sensors, with electrochemical sensors being less common.
Electrochemical sensors can be further divided into solid-state electrochemical sensors and liquid-state electrochemical sensors. Liquid-state electrochemical sensors have a wider range of applications, mainly detecting carbon monoxide concentration by reacting chemical materials with oxygen and carbon monoxide in the air. They are cheaper than solid-state electrochemical sensors, but have three major problems:

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