Hi Dr. KP...I hear you. It can be very disappointing when you try so hard and things don't work. I guess we have to start in the smallest of ways.I had a quick look and there are ways you can address the pollution.Don't get me wrong. I am sure it's not easy.

Planting trees as well as flowers and vegetables maybe?

Have a look at these links. Hope they give you some ideas.

Whatever you do, keep trying, busy as I am sure your are.

Lovely to meet you.

https://www.google.com/search?q=planting+for+biodiversity+where+there+is+pollution&client=firefox-b-d&sca_esv=559287649&ei=eXzlZNvoJaTc1e8Ppo-3SA&ved=0ahUKEwibidv06vGAAxUkbvUHHabHDQkQ4dUDCA4&oq=planting+for+biodiversity+where+there+is+pollution&gs_lp=Egxnd3Mtd2l6LXNlcnAiMnBsYW50aW5nIGZvciBiaW9kaXZlcnNpdHkgd2hlcmUgdGhlcmUgaXMgcG9sbHV0aW9uMgUQABiiBDIFEAAYogQyBRAAGKIESOZwUK4FWI9dcAF4AZABAJgBrwOgAb05qgEIMi0yNC4zLjG4AQzIAQD4AQHCAgoQABhHGNYEGLADwgIGEAAYFhgewgIIEAAYigUYhgPCAgUQIRigAcICChAhGBYYHhgPGB3CAgQQIRgVwgIHECEYoAEYCsICCBAhGBYYHhgdwgIEECEYCsICChAhGKABGMMEGAriAwQYACBBiAYBkAYI&sclient=gws-wiz-serp