Black holes are cosmological features predicted by general relativity where the gravity force associated with the black hole is so great that not even light could escape it once it got too close. Black holes aren't influenced by radiation emanating from the Earth or the pollution of our atmosphere, but instead are hypothesized to form when a stellar body becomes too dense to support its own gravity force and collapses onto itself. The Wikipedia page has some great information about the formation of black holes:

No. Black holes form when an object, such as a star, is so dense that its own internal gravity causes it to collapse in on itself. Most black holes are formed when a large star (about 10 times heavier than our Sun) runs out of fuel, explodes in a supernova, and then collapses into an area only a few miles across. Although Earth’s pollution could not create a black hole, it still poses a serious threat to life on Earth.