Over 2,150 children from 84 summer camps and schools in and around the twin cities participated in the three-day competitions from May 26 to 28 held by AP Pollution Control Board to herald the World Environment Day, according to a press release Saturday.

Results of the competitions will be displayed on June 3 on the notice boards of the APPCB office, Sanathnagar, and the State Art Gallery in Kavuri Hills, Madhapur.