The Snake Plant cleans air better than most other indoor plants as it has the ability to absorb excessive amounts of carbon monoxide. Additionally, it emits oxygen and filters other toxins from the air such as benzene, xylene, trichloroethylene and formaldehyde. (As researched by NASA)
To care for the snake plant allow soil to dry between waterings and take extra special care not to over water in winter. Try to avoid getting leaves wet when you water. Place your snake plants in indirect light (although they are tolerant of a variety of light conditions) and fertilize during the growing season with an all-purpose plant food.