Make sure your home is well ventilated. Open all the windows whenever possible and consider exhaust fans or air-to-air heat-exchanging devices that draw in fresh air through one duct and expel it through another. In addition, make sure stoves and heaters all vent outdoors. Keeping your house constantly closed tight not only prevents harmful pollutants from dissipating, but it also promotes sick building syndrome, a condition in which occupants suffer adverse health effects seemingly related to conditions in their living space. Sick building syndrome can include brain-defeating symptoms like dizziness, fatigue, and difficulty concentrating. At work, try to encourage coworkers to keep windows open. If that’s not possible— many office buildings have windows that don’t open—at least take breaks throughout the day and go outside for a breath of fresh air.