china's most polluted cities for a closer look. >> reporter: these are streets choked with pollution, thick enough to see, to burn your eyes, to leave a taste in your mouth. this is balding, china's most polluted city, where life goes on under the cloak of a toxic shroud. this man grew up here and is raising his young son here, and the air they breathe is always on his mind. when the pollution gets really serious, we can't even see the building next to us, he says. you can't even describe how bad the smell is. like thousands of others here, he gets ready for work and heads out into the haze as a coal power plant turns out taxoxins above. he works in the energy sector, and his company hopes to make