Houston is surrounded by chemical plants, especially raffineries, located mainly to the East, Southeast and South of the city. Their pollution standard are very low, and it is quite common to have very foul odors filling your nose when being outside in Houston. And, well, sometime there are accidents!
This explosion shown on the picture happened in June 2003 in LaPorte (a suburb SE of Houston) and I happened to be driving by that evening with my camera. Nobody got hurt at the Nova plant, but the neighbourhoods located North of the plant got bathed in a foul cloud of benzene derivatives for a few hours, lovely. And the latest, in March 2005, killed several people in a BP factory in Texas City, a town midway between Houston and Galveston.
This striking building, located along Interstate 45 just north of Houston, reminds us that Hunger is present everywhere.