Why did it change from blue to green from one day to the next?

Both athletes and spectators were surprised to see the green water from the dug in Rio 2016 . Even so, competitors follow their routines without knowing in detail the reason for the change.

The International Olympic Committee (IOC) ensures that the water quality in Maria Lenk Water Park and ensures that there is no risk to the athletes' health . Even if the reason why the Olympic pool changed color is unknown.

Video Medicine: Why Are My Messages Sometimes Blue & Other Times Green on My iPhone? : iPhone Questions & Answers (April 2021).