National Public Radio: People living in the smoggiest cities are 30 percent more likely to die from respiratory diseases, including pneumonia than those living in the least smoggy areas, according to a new study published in the New England Journal of Medicine. The nationwide study of 450,000 adults is the first to document the long-term impact of ozone on human health. It’s estimated that 100 million Americans — or one in three — live in cities with unhealthy levels of ground-level. Ground level …