Q: I was driving yesterday and for no apparent reason I almost fell asleep. I have never done that. I was wondering if the car emits carbon monoxide as I drive it?
A: Carbon monoxide, a pollutant, is released from incomplete combustion in internal combustion engines. If there is a leak in the exhaust system you could be getting this odorless, colorless, and poisonous gas in the vehicle. Symptoms include headaches, shortness of breath, dizziness, fatigue, nausea, and confusion. I would get the vehicle inspected by a qualified technician right away. In the meantime, keep plenty of air moving through the car by keeping the windows open.