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In 1996, Steve Wing, an epidemiologist at the University of North Carolina, was among the first to provide evidence of the disproportionately harmful health impacts on poor people of color caused by industrial-scale hog operations. Recently, the National Academy of Sciences published the first comprehensive assessment of U.S. deaths from airborne agricultural pollutants. This research provides strong vindication of the path-breaking work of Wing and his colleagues.
According to the new study, U.S. agricultural production results in 17,900 air quality-related deaths per year, with about 80 percent of these deaths due to airborne contaminants from large-scale animal farms. Emissions from animal factory farms, known as confined animal feeding operations (CAFOs) account for more annual deaths than pollution from coal power plants.
One out of every four of these deaths is from pork feeding operations, which generate billions of gallons of waste, largely dumped directly in open lagoons and then sprayed on farmland. Much like human waste, the hogs expel large amounts of bacteria-laden pathogens, hydrogen sulfide, and ammonia.
Dr. Steve Wing, left. Credit: North Carolina Environmental Justice Network.
A typical CAFO holds thousands of hogs in cells just large enough for the animals to stand in place. They are fed by conveyor belt along with antibiotics to stem infections and stimulate growth. In southeastern North Carolina counties, about 10 billion gallons of fecal waste is dumped directly from the animal cages into the lagoons each year.
After anerobic digestion (a process by which the waste is placed in tanks and broken down to produce biogas and biofertilizer), the waste is sprayed over fields. Based on geospatial data, the Environmental Working Group reports that more than 250,000 homes in North Carolina are within three miles of a CAFO.
Over several years, Wing and his colleagues compiled a large body of data indicating that emissions from open lagoons and field spraying were harmful to nearby residents. They documented increases in blood pressure, asthmatic symptoms in children, headaches, diarrhea, and upper respiratory problems. Odors, described as being “like the smell of rotting corpses,” were so strong and pervasive that residents could not venture outside of their homes for days on end.
Wing and his colleagues reported that Black, Latino, and American Indian residents in North Carolina were nearly twice as likely to suffer from health problems associated with toxic fecal waste in the air because they were much more likely to live within three miles of such operations. They pointed out that industrial hog facilities are relatively absent from low-poverty white communities in the state.