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For indoor settings, the acceptable level of carbon monoxide is stated by WHO which recommends 9-10ppm for no more than 8 hours. 25-35ppm for no more than 1 hour and 90-100 ppm for no more than 15 minutes. Below is an easy to use reference chart for carbon monoxide levels suitable to print. Download a copy of the chart here (pdf).
adults will have symptoms: headaches, nausea. NIOSHA & 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.
Carbon monoxide (CO) is a colourless, non-irritant, odourless and tasteless toxic gas. It is produced by the incomplete combustion of carbonaceous fuels such as wood, petrol, coal, natural gas and kerosene.
The CO levels in homes are usually lower than 9 ppm; however, the peak value in homes could be up to 18 ppm with gas stoves, 30 ppm with wood combustion, and 7 ppm with kerosene heaters. The CO concentrations inside motor vehicles are generally 9-25 ppm and occasionally over 35 ppm.
Carbon monoxide (CO) is an odorless, colorless gas produced when fossil fuel is burnt. CO poisoning can cause sudden illness and death, but it can be prevented. View All
According to the Commission des normes, de l'équité, de la santé et de la sécurité du travail (CNESST), carbon monoxide can be classified as: Flammable gases - Category 1. Gases under pressure - Compressed gas. Acute toxicity - inhalation - Category 3.
Carbon monoxide (CO) is a colorless, odorless, and toxic gas, which is predominantly produced by incomplete combustion of carbon-containing materials. Incomplete combustion occurs when insufficient oxygen is used in the fuel (hydrocarbon) burning process.
