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Keyless car operation: Posing a carbon-monoxide-poisoning risk?

Among the more recent features related to automobiles is keyless operation.
Such a feature is considered by many to be a convenience. But, with this convenience a problem has surfaced.
At issue
“CO mixing ratio (ppbv) @ 850 hPa”
According to a May 13, 2018 New York Times article, since the year 2006, almost three dozen deaths have occurred as a result of internal-combustion-engine motor vehicles having been left running while in enclosed spaces like garages subsequent to their being parked, the drivers of such believing that the vehicles’ ignitions were turned off. Such inadvertent error has left even more with injury, according to


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