Exactly how secure clean air in your residense or office? The answer to that question thanks researcher who resides one of the most polluted cities in the planet: Delhi. The problem of insufficient clean air and touched him personally as a result of allergies his lung capability decreased to 70%. With the help of NASA discovered how you can ensure access to fresh air while living even in such a polluted place like Delhi. The solution to your trouble is not found anywhere else than in nature. As it turns out, there are three ordinary houseplants, which are able to offer human survival even within a tightly enclosed space!