Is it obligatory to ascertain whether a company adheres to environmental laws and does not pollute the environment beyond permissible limits, and is it forbidden to deal with it if it is an environmental polluter?

There is no harm in working with the company's products as long as they are permissible. There is no need to investigate and research the issue of environmental pollution. However, if it is proven that the products clearly harm the environment, then those in charge of the company must be advised to stop anything that harms the public interest and the environment, and the distribution of anything proven to be harmful must be stopped.