That’s the sort of question that requires distinguishing the amount of pollution you would make versus the thing you are blowing up. It may factor in if they will rebuild it and continue, or if they would not rebuild.

I would hazard a guess that in the majority of circumstances, blowing up a polluting company would be less pollutive than said company is, except for if they were to rebuild (since I would consider the resources for rebuild a necessity since you blew them up).

This is not an endorsement to explode anything, this is simply an analysis of factors about factories and their ecological terrorism.