Never operate a charcoal grill indoors. It is not ok to warm up your car in a closed garage. Carbon monoxide can with the door closed build up quickly. Always leave the garage door open and be sure the tail pipe vented to the outside. Keep windows and entry doors to home closed.
Carbon monoxide is heavier than air.
Carbon monoxide weighs virtually the same as air and mixes in with the oxygen we breathe. When a room that has high levels of carbon monoxide is ventilated with fresh air, the carbon monoxide dissipates quickly. Only high level exposures to carbon monoxide are harmful. Low levels of carbon monoxide have been shown to cause various health problems, including nausea, dizzy spells, vomiting, headaches, fatigue and sexual dysfunctions, according to Vector Consumer Newsletter, 1988. Certain populations such as unborn babies, young children, the elderly and anyone with cardiac or respiratory problems are at increased risk.