Scientific advancement means taking a journey to the unknown, breaking the boundaries, and taking risks, all in the name of better living. The waste products of science can be sloppy, dangerous, and even lethal, but without this process we might still be living in caves. You can't make an omelet without breaking a few eggs and you can't have scientific development without some pollutants. Science has a price.
Pollution usually occurs from people who are careless or don't care about the environment. Through many laws, scientific development usually are limited to the amount of pollution they can create. Most of the pollution on Earth is mostly from normal humans who don't throw away their trash, and also factories who don't filter their air.