... (ppm) in the air, you will suffer slight headache, tiredness, dizziness and nausea after 2-3 hours. ... death within 2-3 hours. At 1600 ppm: Headache, dizziness & nausea within 20 minutes and death within ... poisoning : If you feel drowsy, overtired, have a headache, dizziness or nausea, or have pains in the ... : If you feel overtired or even have a headache, CHECK THE DETECTOR It could save your life. ...