What symptoms are associated with low concentration exposure to carbon monoxide (CO)?

Low concentration exposure to carbon monoxide (CO) is primarily associated with symptoms that are often mild and nonspecific. Shortness of breath and mild nausea are typical manifestations when someone is exposed to lower levels of CO. At low concentrations, the body is affected by CO's ability to bind with hemoglobin, reducing oxygen delivery to tissues. This can result in these mild physical symptoms as the body struggles to get adequate oxygen.

At higher concentrations, symptoms can become more severe, typically leading to headaches, confusion, and more serious health effects, but at lower exposure levels, individuals often experience more subdued symptoms such as shortness of breath and slight nausea. This makes the option highlighting shortness of breath and mild nausea the most accurate choice concerning low concentration exposure.