In June, dozens of runners raced through parts of Cedar Rapids as volunteers tossed fistfuls of brightly colored powder into the air and at participants. The powder, the main attraction of a race ...

During the past several years, themed races have become extremely popular. Social media is plastered with pictures of people jumping through fire, running through clouds of colored dust, and even ...

Brightly colored powders, shot into the air at running events and some concerts, are designed to breathe excitement into those events. But have you ever wondered how safe those powders are to breathe?

ORLANDO, Fla. — Every race season, a rainbow of runners storm through clouds of colored powder. "It was awesome,” said runner Mimi Wilk. The pigments make for perfect pictures. "It's just a fun run, ...