I remember working as an Au pair many years ago in a wealthy family in London. Coming from a house where each room had at least two indoor plants, I was surprised to find out that this rich family did not have one single living plant in their home. According to statistics, in developed countries inhabitants often spend over 90% of their time indoors but indoor air has been reported to be as much as 12 times more polluted than that outdoors. 
What might seem as a time consuming hobby, having living plants in your home can actually clean your air, reduce stress and thus prolong your life.
There are several chemicals such as benzene, formaldehyde, trichloroethylene, xylene, and ammonia from our surroundings which can cause acute illnesses (e.g., asthma, nausea) and chronic diseases (e.g., cancer, immunologic, neurologic, reproductive, developmental, and respiratory disorders). These chemicals come from glue, paint, furniture wax, floor waxes, synthetic fabric and many other household items.
An older study on plant abilities to purify the air, conducted by NASA is still regarded by many as the most comprehensive and accurate to date. Check out this image of the most effective air-cleaning plants. 
The best Air Purifying Tips
1. Have at least one plant per 100 square feet (10 square meters).
2. The bigger and leafier the plant, the better.
3. Clean your home naturally without harsh chemicals.
4. Open your windows as often as possible, even in winter, for at least 5 minutes.
5. Diffuse high quality essential oils to purify the air.
6. If you use air-filtering system, change filters frequently.