A new yoga studio has been opened inside Terminal 3 at Chicago O’Hare International Airport, and it offers a quiet space for travelers to meditate, stretch and take a deep breath. “We’ve essentially created an urban oasis at the airport,” said Rosemarie Andolino, commissioner of the Chicago Department of Aviation. The room, open from 6 a.m to 10 p.m. daily, does not come with an instructor — just mats and disinfectant wipes. Travelers may use the space for free. The small studio, located on the second level of the rotunda, is meant to serve the 67 million passengers who travel through the airport every year, half of whom never exit security, according to Andolino. Several airports have opened yoga studios in their terminals, the first being San Francisco early last year. Andolino said no tax dollars were used for the project, which didn’t cost much because the space was available. The rotunda at Terminal 3 has been underused since the Sept. 11 attacks, she said, when nonpassengers were no longer allowed to use the conference rooms. The rotunda at Terminal 3 is now being redesigned around a theme of green and healthy. Next to the studio, an urban garden grows vegetables that are used in airport restaurants and sold at the airport’s fresh market below.