Carbon monoxide safety during the summer months
Carbon monoxide safety during the summer months
June 09, 2025
Brother and sister getting back on boat after swimming in the lake

Know the common causes and warning signs of summertime CO poisoning

Carbon monoxide, or CO, poisoning occurs more commonly during the fall and winter as we fire up those fuel burning devices – but the risk doesn’t go way in the summertime! Traveling, camping and boating are popular summer activities that come with the potential for CO poisoning.

Carbon monoxide is a colorless, odorless and tasteless gas that’s produced from a fuel burning appliance or device. When the gas is released indoors or fumes aren’t vented well, CO can build up to dangerously high levels and lead to poisoning. Small children, pregnant people or those with heart disease are at higher risk for serious impacts.

Per the CDC, each year, more than 400 Americans die from unintentional CO poisoning not linked to fires, more than 100,000 visit the emergency room and more than 14,000 are hospitalized.

Be aware of the following potential CO sources during the summer months

  • Boat engines (traveling at slow speeds or idling in the water can cause CO to build up in the boat’s cabin, cockpit, bridge or open areas)
  • Car/RV engines
  • Gas water heaters
  • Gas stoves/ovens/grills
  • Generators

Tips for preventing CO poisoning while boating

  • Properly install and maintain all fuel-burning engines and appliances.
  • Swim and play away from areas where engines vent their exhaust.
  • Keep a close eye on children as they play on rear swim decks or water platforms.
  • Never block exhaust outlets.
  • Dock, beach or anchor at least 20 feet away from the nearest boat that is running a generator or engine.

Tips for preventing CO poisoning while traveling or camping

  • When planning your travel accommodations, ask if the space is equipped with carbon monoxide detectors. Be sure to ask when the CO detector was last tested and replaced.
  • Carry a portable CO detector for added safety.
  • Do not use charcoal or gas grills in the house, garage or any other enclosed space.
  • If you (or your neighbor) use a generator, make sure it’s outside more than 20 feet away from air intake vents, windows and doors leading to the home.
  • Ensure vents are open, when possible, on RVs/campers for proper air flow.
  • Check for exhaust obstructions (high grass, weeds, buildings) when parking campers/RVs.

Watch for the symptoms of CO poisoning

Mild symptoms of carbon monoxide poisoning include:

  • Headache
  • Dizziness
  • Nausea
  • Weakness
  • Fast heartbeat

More serious symptoms include:

  • Vomiting
  • Coma
  • Confusion
  • Loss of consciousness
  • Heart attack

What should you do if you notice symptoms, or are concerned about carbon monoxide poisoning?

  • Get the person to an area with fresh air and call the Virginia Poison Center at 1-800-222-1222 right away for 24/7, fast, free and confidential medical assistance.
  • If the person has collapsed, had a seizure, has difficulty breathing or cannot be awakened, call 9-1-1.

By Shelly Clary, educational specialist, Virginia Poison Center

Find more poison prevention information from our Virginia Poison Center.

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