Epidemiologist Joel Schwartz is noted for his work on the acute and chronic health effects of fossil fuel air pollution.  One of his recent collaborative studies revealed that exposure to fine combustion particles in the air at concentrations well below current standards are associated with a range of conditions, including dementia, asthma, heart attacks, and lung cancer.  The study indicated that the death rate from this pollution is almost 1 in 5 deaths worldwide, about twice the previous mortality estimate.  Not surprisingly, the pollution impact falls disproportionately on poorer communities.  This research is finally leading to tighter U.S. air quality standards. In this program, Dr. Schwartz discusses the wide health effects of fossil fuel pollution and why restrictions have been so lax.