Wyoming has dropped from the top 10 happiest states in America, according to the Gallup Healthways Well-Being Index.

Gallup surveys Americans for their emotional and physical health, behaviors, work environments and nutrition and medical access.

Surrounding states, including Utah, Colorado, Montana, Nebraska –all made the top 10 list in 2011, but Wyoming has dropped to the middle of thepack at number 21.

Dan Witters leads analysis of the Well-being Index. He says emotional health and work environments in Wyoming have deteriorated in the past year.