Lets say i breath in air inside a house, would there be carbon monoxide? and would it leave the body right away?

Carbon monoxide binds tighter to red cells than oxygen and can produce physical symptoms or result in death. However, as long as a person has access to normal oxygen containing air after the exposure the carbon monoxide would eventually be released from the red cells and exhaled from the body. over minutes to hours.

Carbon monoxide levels can rise inside a house if a faulty heating system, fixed or portable, is present. A carbon monoxide detector can be purchased to provide protection. If true intoxication does occur, this is a medical emergency and must be handled immediately to prevent catastrophic consequences. The detector is well worth the cost.