North Carolina Air Pollution
Doug Bradley / Flickr

Duke University researchers have found a connection between state and federal air pollution restrictions and improved public health in North Carolina.

Duke Surgery Professor H. Kim Lyerly and his team evaluated disparate data from air quality monitoring stations and health statistics between 1993 and 2010. Lyerly said air quality improved, and so did respiratory health.

Accounting for seasonal changes and an overall drop in smoking, Lyerley said annual emphysema-related deaths dropped from 12-per-100,000 people, to five. Asthma and pneumonia-related deaths decreased, too.