I arrived at checkin time of 11am. Staff told me the place wasn't ready and return later. I returned at 4pm and the smell of exhaust fumes were so heavy I immediately got sick. There is a public valet parking garage in the building below the unit and the fumes are in the apartment. I tried to wait and it never improved. THERE ARE NO CARBON MONOXIDE DETECTORS IN THE HOME. I was fearful to sleep in the home for fear of dying from CO poisoning. I left at 7pm, cancelled the booking, and notified the host. I immediately booked another reservation on AirBnB at a higher price for the duration of the trip. I expect a full refund as the home is not safe for human habitation without proper ventilation and detection.