Carbon Monoxide Safety: How to Protect Your Home and Family

By White Glove Building Inspections | Chicagoland, IL

Safety disclaimer: This article is for educational purposes only. If you suspect carbon monoxide (CO) poisoning or any emergency, call 911 right away.

Why carbon monoxide deserves your attention

Carbon monoxide is colorless, odorless and tasteless, yet it sends more than 100 000 people to U.S. emergency rooms each year (Centers for Disease Control and Prevention). Because CO displaces oxygen in the bloodstream it can harm you before you notice anything is wrong.

Our team routinely finds outdated alarms, blocked flues and poorly vented appliances during inspections. A few simple steps can stop these problems from turning into tragedies.

What produces CO inside (and outside) a home

• Furnaces and boilers

• Water heaters

• Fireplaces and wood-burning stoves

• Gas ovens, stoves and dryers

• Portable fuel-burning heaters or generators

• Vehicles idling in an attached garage

Why it is dangerous

CO binds to hemoglobin more readily than oxygen. Early symptoms—headache, nausea, dizziness and confusion—can mimic the flu. At higher levels or longer exposures CO causes loss of consciousness and, in extreme cases, death .

Understanding CO levels (ppm) in plain English

Guideline	Threshold	Source	What it means for homeowners
EPA recommendation	9 ppm over 8 hours	EPA Indoor Air Quality	Ideal long-term indoor limit
OSHA workplace limit	35 ppm over 8 hours	OSHA	Maximum exposure on the job
Typical alarm trigger	70–150 ppm (varies)	Manufacturer specs	Alarm sounds after set time

Alarms sound above health-protective levels because they are designed to reduce nuisance alerts. Symptoms, however, can appear at lower concentrations.

Illinois requirements and placement basics

• Illinois law requires a CO alarm within 15 feet of every sleeping area.

• Place alarms on each level of the house and, when possible, 5 feet above the floor for optimal readings.

• Follow manufacturer instructions for mounting height and replacement (usually every 5–7 years).

• For details, consult the Illinois State Fire Marshal’s CO Alarm Fact Sheet (PDF).

Five practical steps to cut CO risk

1. Install and maintain CO alarms

• Put alarms on every level and near all bedrooms

• Test alarms monthly and replace batteries yearly

• Replace any unit that has reached its end-of-life date

• Do not ignore chirping or “end” messages

  
  

2. Service fuel-burning appliances annually

A licensed HVAC technician should clean burners, confirm proper draft and check heat exchangers. A blocked flue or cracked exchanger can leak CO without warning.

3. Use combustion appliances safely

• Never use a gas range or oven for space heating

• Keep charcoal grills and portable heaters outdoors

• Run generators at least 20 feet from doors, windows and vents

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4. Be cautious with vehicles and garages

• Do not idle cars in an attached or enclosed garage—even with the door open

• Clear snow or debris from tailpipes before starting a vehicle

  
  

5. Know the symptoms and act fast

If anyone experiences headache, dizziness, nausea, weakness or confusion, evacuate immediately and call emergency services. Do not re-enter until first responders give the all-clear.

Trusted resources

• CDC – Carbon Monoxide Poisoning: https://www.cdc.gov/co/

• EPA – Indoor Air Quality & CO: https://www.epa.gov/indoor-air-quality-iaq/carbon-monoxide

• Illinois State Fire Marshal – CO Alarm Fact Sheet (PDF)

• NFPA 720 – Standard for CO Detection and Warning Equipment