S.C. DHARMADHIKARI, J.

1. All these petitions involve common questions of fact and law and are being disposed of by this common judgment.

2. We grant Rule in all the petitions. The Respondents waive service. By consent, Rule is made returnable forthwith.

3. The lead arguments have been canvassed in Writ Petition No. 2665 of 2018. Hence, we take the facts from the pleadings in that petition. The petitioners in that petition are a Co-operative Housing Society registered under the Maharashtra Co-operative Housing Society Act, 1961 and the second petitioner thereto is a senior citizen and Chairman of the petitioner No. 1-society. The first respondent is the State of Maharashtra through the Department of Environment and the second respondent is the Collector of Pune District. The third respondent to this petition is the Commissioner, Pune Municipal Corporation and the fourth respondent is the Pimpri-Chinchwad Municipal Corporation. Respondent Nos. 5 and 6 are private parties. They are original respondents in the proceedings before the National Green Tribunal (for short “NGT”). They are engaged in construction activities. The seventh respondent is the Secretary of the Environment