Presiding over the seminar ``The Environment Chandigarh'', former principal of College of Architecture, S.S.Bhatti, said there should be greater involvement of citizens in forming the master plan of new sectors. ``Those residing in slums are an indispensable part of the city's population. They should be provided with easily affordable, hygienic and eco-friendly accommodation and other amenities'', he suggested. Environment Society president S.K.Sharma, said a Coordination Council of representatives of Chandigarh, Mohali and Panchkula should be constituted to solve environment related problems.