Why is Coco orange?

"Coco has a problem. He's a chameleon, but he can't change colors, and his asthma is acting up. Read how Coco and his friends at Lizard Lick Elementary solve this mystery as they learn about air quality and how to stay healthy when the air quality is bad. This book is for all children, especially those with asthma and their caretakers. Ages 4-8." --t.p.