Your thoughts make you the person you are. If you nurture good, positive, healthy thoughts, you can easily purify the toxic environment around you. However, sometimes your environment influences the way you think, feel and act too which is why it's good to keep yourself in good company and stay in a positive environment so you can strengthen your positive mindset and make it strong enough to combat all sorts of impurities and negativities. :)
Thank you very much for the nice comment