Hello! the air and the water/hence the near sea food might be polluted in my living region. what could i do in my living and eating to combat harms?

Move away!: Well, let's not get ahead of ourselves. You stated that the environment "might be polluted", not that it was. Therefore, you may not have to combat anything at all. So don't move unless you have to do so. However, if it's true that there is contamination, then there's not much that you can do aside from trying to eat "organic" foods that might have less chemical exposure.