New CO Study Shows that Home Generators Can Emit Dangerously High CO Levels

A new study simulating carbon monoxide levels in detached and manufactured homes commissioned by the U.S. Consumer Product Safety Commission shows that that operating a generator for 18 hours is likely to result in high CO exposures whether the generator is in the house or the garage; and that generators that have been modified to limit CO emissions using a shut-off mechanism or other technology can significantly reduce exposure compared to generators without emissions controls.

Last September, our blog Home Use Generators: Dangerous and Behind the Curve documented the rising incidence rate of CO poisonings linked to the use of home generators as extreme weather events and an aging power grid result in more and more prolonged outages. The agency’s response has been to closely track the data and promulgate a stronger warnings rule. Heightened hazard language has done little to dissuade homeowners from putting portable generators in locations that can create significant health risks for home occupants.

The simulation study authors noted that CPSC has recorded 755 deaths from CO poisoning associated with home generators, from 1999 through 2011, with nearly three-quarters of those occurring between 2005 and 2011, and many of which occurred during power outages.

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