From The Guardian:
“From the moment the US launched its campaigns in Afghanistan and Iraq, the Pentagon ordered the use of open-air burn pits to dispose of the wars’ massive volume of waste. The military relied heavily upon these sprawling ditches, which burned around the clock to consume the tens or even hundreds of tons of junk generated daily. By May 2003, according to Hickman, there were more than 250 burn pits at US bases peppered across the two nations…
…Among the other hazardous items service members recall being burned are: petroleum, oil, rubber, tires, plastic, styrofoam, batteries, appliances, electrical equipment, pesticides, aerosol cans, oil, explosives, casings, medical waste and animal and human carcasses. They also used jet fuel to stoke the fire.
These materials converged in a toxic plume that hovered over the base, and seeped into soldiers’ sleeping and working quarters, which were often a mile or less away.”