Tomorrow on the EXPOSÉ site: With a smell in the air, residue on their cars, and their eyes occasionally burning, residents of Houston's "fenceline" communities - those that border many of the cities petrochemical plants - have often wondered what it was they were breathing. And when HOUSTON CHRONICLE environmental reporter Dina Cappiello knocked on their door, they were about to find out.

>> Watch the full episode of "The Scientific Method" on the EXPOSÉ site tomorrow.