In the last few years, the Supreme Court has even ordered a few hundred factories which did not comply with the Court's order to close until they installed pollution control devices and meet prescribed standards. In India, we are fortunate that Article 21 of the Indian Constitution gives the Right to Life. The Supreme Court of India has broadened the scope of this Right to Life to include the right to live in a healthy environment. The right to live in a healthy environment implies access to clean air and water. If I am breathing unclean air, or drinking contaminated water, I cannot live a healthy life.
Pollution is thus a threat to life.
And if there is a threat to life, a citizen can go to court and file a petition. You have to substantiate everything with scientific reports and data. The Court will only intervene after you have fulfilled these stringent requirements. Thirty percent of the Ganges' pollution is being caused by industry. The Court has ordered the polluting factories to install pollution control devices, and many are now doing that.