A new study out today links natural gas drilling with increased risk of asthma. Here’s the press release from the Journal of the American Medical Association’s Internal Medicine journal:
Residential unconventional natural gas development activity, a process that involves fracking and creates a source of energy used both domestically and internationally, was associated with increased risk of asthma exacerbations in a study of patients with asthma in Pennsylvania.
Asthma is a common chronic disease with nearly 26 million people in the United States with asthma. Outdoor air pollution is recognized as a cause of asthma exacerbations. Unconventional natural gas development (UNGD) has been associated with air quality and community social impacts, such as air pollution from truck traffic and sleep disruption.
Pennsylvania has moved rapidly with UNGD and more than 6,200 wells were drilled between the mid-2000s and 2012.
The release explains:
Brian S. Schwartz, M.D., M.S., of the Johns Hopkins Bloomberg School of Public Health, Baltimore, and coauthors looked at associations between UNGD and asthma exacerbations.
The authors compared patients with asthma with and without exacerbations from 2005 and 2012 who were treated at Pennsylvania’s Geisinger Clinic. The study included 35,508 patients identified in electronic health records.
The authors estimated activity metrics for the four phases of UNGD (pad preparation, drilling, stimulation and production) using the distance from patients’ homes to the wells, well characteristics and the duration of phases.
Between 2005 and 2013, 6,253 unconventional natural gas wells were spudded (the start of drilling) on 2,710 pads; 4,728 wells were stimulated and 3,706 were in production.
The authors identified 20,749 mild (new oral corticosteroid medication order), 1,870 moderate (emergency department visit) and 4,782 severe (hospitalization) asthma exacerbations and matched those to control index dates for comparison.
Patients with asthma in areas with the highest residential UNGD activity had higher risk of the three types of exacerbations compared with those patients in the lowest group of residential activity, according to the study results.
Here’s a link to the study and here’s a story about it that was posted earlier by State Impact.