Even Slight Increases in Ambient Carbon Monoxide Could Increase Mortality Written by AZoCleantechApr 9 2021 A new study gathered data from 337 cities from 18 countries, which indicates that even a minor increase in the ambient levels of carbon monoxide emitted from automobiles and other sources are linked to increased mortality. Image Credit: Bikeworldtravel/shutterstock.com Under the guidance of Assistant Professor Kai Chen from the Yale School of Public Health, a group of scientists examined data, which includes 40 million deaths in total from 1979 to 2016, and processed it using a statistical model. Related Stories Published recently in the journal The Lancet Planetary Health, the study discovered that even brief exposure to ambient carbon monoxide (CO)—at levels below the present air quality guidelines and regarded safe—was linked to increased mortality.