The BBC reports this week that the World Health Organization has estimated around 7 million people acquired fatal diseases in 2012 due to bad indoor and outdoor air quality. Their study found that a majority of air pollution deaths were cardiovascular in nature and included heart disease, stroke, chronic obstructive pulmonary disease, and lung cancer. The WHO called air pollution "the world's largest single environmental health risk", which means that treating your body to oxygen therapy is more important now than ever.