Shanghai Pudong International Airport had started investigating possible leaks in airplane septic tanks after residents in the Luchaogang community in Pudong New Area complained about human waste falling from the sky when planes fly over, local media reported Sunday.
A resident surnamed Zhou said that he first thought it was just rain, but discounted that notion after he got a whiff of the stinky fluid, according to a news report aired on Shanghai Television Station (STV).
He said he had been hit by the suspicious fluid, which falls all over the neighborhood, including on residents' cars and hanging laundry.
The STV report showed video of yellow drops on vehicles in the community, which sits under a busy air route. Planes fly over every five to 10 minutes during morning rush hour, which resident said was usually the time the drops appear.
Experts said that it's possible for chemically treated human waste to leak from a plane's septic tank. The liquid freezes when a plane is flying at a high altitude, but it falls like rain when the plane is flying low, the Xinmin Evening News reported.
Pudong airport said it could not rule out the possibility that the phenomenon is caused by a leaky septic tank.
The problem has been reported before. Residents of a town near the Auckland Airport in New Zealand complained in 2011 that their homes had been splattered with brown stuff that smelled like feces, according to ONE News.