Invisible, silent, and deadly – carbon monoxide (CO) is a common yet often overlooked workplace hazard. As temperatures drop during winter, the dangers only intensify as increased reliance on fuel-powered equipment and heating systems heightens the risk of CO buildup in enclosed or poorly ventilated spaces. In 2022, there were 624 accidental CO poisoning fatalities in the US, with tens of thousands more requiring hospitalization. 

What is Carbon Monoxide Poisoning?

CO is a colorless, odorless, and tasteless gas produced by almost any burning fuel, including wood, propane, and charcoal. When inhaled, CO binds to hemoglobin in the blood, preventing oxygen from reaching vital organs. According to toxicological data, CO levels as low as 0.01% (100 parts per million) can cause symptoms, such as headaches, dizziness, nausea, and vomiting, within two hours of exposure. Meanwhile, prolonged exposure can lead to confusion, loss of consciousness, and even death. 

The Amplified Dangers of CO Poisoning in Winter

Winter weather conditions create a perfect storm for CO hazards. Lower temperatures often force workers to move operations indoors, including tents or tarped off areas. While these environments provide warmth, their limited ventilation can trap CO emissions from equipment like forklifts, welding tools, and other fuel-powered machinery, leading to dangerous CO buildup. 

Moreover, snow or ice can cover rooftop vents, chimneys, or air intakes, leading to poor air circulation inside buildings. This is of particular concern in older facilities or remote locations with limited access to maintenance crews. 

Practical Steps for Preventing CO Poisoning in Worksites

Work-related incidents account for a significant portion of CO poisoning cases. Fortunately, a proactive approach to safety can drastically reduce the likelihood of CO-related workplace incidents. 

Conduct Regular Hazard Assessments

Having trained safety professionals conduct periodic hazard assessments is pivotal to CO poisoning prevention and the overall safety of worksites. These inspections involve a comprehensive evaluation of the entire workplace environment, with safety professionals assessing potential sources of CO buildup, such as processes, materials, equipment, and HVAC systems. They also evaluate the effectiveness of current controls and identify gaps or areas of improvement. 

By conducting regular hazard assessments, employers can proactively detect and address risks before they escalate into dangerous situations. These evaluations also ensure compliance with OSHA standards and foster a safer, healthier environment for workers.

Install Fixed Gas Detectors

Installing fixed gas detectors in fully or partially enclosed workspaces is essential if there is any risk of CO leaks or buildup, no matter how small. Fixed gas detectors are used to monitor specific areas over a long period of time and  are critical for maintaining safety in environments where carbon monoxide may accumulate, including:

• Enclosed spaces, such as tunnels, shafts, excavations, basements, and warehouses
• Areas where chemicals are stored or used
• Areas using fuel-powered equipment 

The type of gas monitor you need depends on the worksite’s specific atmospheric hazards, as different environments pose varying risks. While CO is a primary concern, it’s rarely the only danger lurking in industrial settings. Confined spaces might also harbor other hazardous gases and conditions like methane (CH4), hydrogen sulfide (H2S), or insufficient oxygen. To ensure you have the appropriate device, consult a qualified safety professional. 

Ensure Adequate Ventilation

Installing the appropriate ventilation systems across worksites is one of the most effective strategies to prevent CO buildup. Ventilation systems must be designed to meet the specific requirements of work areas, accounting for the type and intensity of activities that generate CO and other hazardous gases. This is especially crucial in areas where the following activities are commonplace:

• Operating fuel-powered machinery
• Welding and similar combustion-intensive processes
• Storing volatile chemicals and fossil fuels

Remember to keep vents and flues free of debris by scheduling regular maintenance to ensure optimal performance. Fragments and other residual elements can block ventilation lines, trapping CO inside buildings and other work areas. 

Limit the Use of Fuel-Burning Equipment Indoors

Whenever possible, avoid using fuel-powered machinery in enclosed and confined spaces. While the CO emitted by smaller equipment like wet saws and space heaters is negligible, just a few hours of use in enclosed spaces can lead to CO poisoning. Even in seemingly well-ventilated areas, CO can rapidly accumulate and reach dangerous concentrations within minutes. 

Where applicable, consider battery-operated tools and equipment. But, if you must use fuel-burning equipment in enclosed spaces, provide workers with portable gas detectors. These alerts workers to dangerous CO levels with audible, vibrating, and visual alarms. 

Inspect and Maintain Equipment

Generators, space heaters, power tools, and other fuel-powered equipment operate more efficiently when in optimal condition. For example, a well-maintained generator can provide the required power without over-exerting itself or producing excess CO. Similarly, heating systems with routine maintenance remain efficient, keeping CO emissions to a minimum. 

To maximize safety, always refer to the equipment’s instruction manuals. Following the manufacturer’s guidelines for proper setup, operation, and maintenance ensures the equipment functions as intended, reducing the risk of CO exposure while extending the lifespan of your 

tools.

Establish an Emergency Response Plan

A comprehensive emergency response plan (ERP) outlines the precise steps workers must take in case of a suspected (or confirmed) CO exposure to facilitate a swift and organized response. An ERP for CO poisoning should include the following:

• Evacuation procedures: The plan should identify routes for evacuating the worksite during a CO buildup/leak, including alternate routes when snow or ice becomes a factor and a designated assembly area where employees can be accounted for.  
• First aid measures: This could include using respirators, administering oxygen, and calling 911. 
• Chain of command: This involves identifying persons responsible for making decisions and coordinating the response. 

When crafting your ERP, involve your workers. They can provide invaluable insights for matching the realities in the field with the appropriate procedures. 

Create Safety and Awareness Programs

An educated workforce results in safer work environments. To mitigate the dangers of CO poisoning, create safety and awareness programs covering the following:

• Occupational Safety and Health Administration (OSHA) standards for CO exposure limits
• Recognizing the symptoms of CO poisoning and taking immediate action
• Using and maintaining PPE, including respirators and gas detectors

Remember, even the most comprehensive training can fade over time. Regular refresher courses help ensure workers retain critical knowledge and stay updated on new safety technologies and protocols. Incorporating real-world scenarios, such as simulated drills, helps reinforce best practices while keeping safety top of mind. 

As the chill of winter sets in, remember that staying warm should never come at the cost of worker safety. Preventing CO poisoning requires a proactive and vigilant approach. By observing the safety measures discussed above, you can maintain safe and productive work environments in the face of the season’s challenging conditions.