Spider plants have the ability to remove formaldehyde, nitrogen dioxide, carbon oxide, ozone, benzene, toluene, cigarette smoke and ammonia from indoor air. They are extremely easy to care for as they are able to thrive in indirect sunlight and tolerate a range of temperatures.
Snake Plants, which are also known as Mother-in-Law's Tongue, remove toxins such as formaldehyde, xylene, toluene, and nitrogen oxides. They are also very easy to care for as they tolerate low light levels and infrequent watering.
Peace Lilies also have the ability to remove formaldehyde, benzene, trichloroethylene, xylene, ammonia, and other pollutants from the air. They prefer bright and filtered light and grow best in warm, humid climates.
Full list of air purifying plants here