It has No filter! Headache? carbon monoxide can't be smelled. You might want to have the exhaust system checked. Worse in the winter because the car's windows are up longer.
new exhaust could have pin hole or other leak.
if it is from body shop dust then try a mask you can get cheap ones a most any paint store. if no more headache then take mask off if headache comes back it could be dust particles. but if mask does not help it is not dust:frown
headache while driving is not something to ignore.:eek get it fix asap:smile
Use one with a digital gauge that shows the reading , not just the one that alarms when levels are high
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