Basically I saw this movie when I was young... the things that I remember:

There is a family of moles or some type of rodents and they leave home because their area is being destroyed... they go off to find something but in there travels they go to this area and there is bulldozers and construction equipment that looks like it is attacking them... eventually they get home and when they do this poisonous gas is all around and one of the little guys gets stuck in a trap and some dude in a quarantine suit helps them get out... sounds crazy but really need help... please help

That is called "once upon a forest"... I love that movie