Grow some money plants at your home. It releases oxygen, and also filters formaldehyde (released by adhesives used in wood furnishings) & cigarette smoke.

Money plants (Epipremnum aureum) not only bring beautiful natural accents room design, but they also help cleanse air. Formaldehyde (commonly released by adhesives used in wood furnishings) can irritate the mucous membranes of the eyes, nose and throat, and is one of the leading causes for the development of asthma.