Yesterday, I examined some of the EPA TAGA data showing a recent dramatic increase in toluene and xylene levels around Pensacola, FL., specifically the area covered by the shaded triangle:
I focused on the dramatic increase in toluene and xylene because the benzene levels were relatively constant. 
However, that doesn't mean the benzene levels are irrelevant. If anything, the benzene levels are the most disturbing of the three. The AVERAGE benzene concentration is now 3 times the EPA levels, even higher than previously measured. (warning:PDF)
The 20 microgram/cubic meter limit set by the EPA is equivalent to 6.26 ppb in air. As you can see from the chart, Pensacola's AVERAGE measurable benzene levels are between 15 and 19 ppb. In some places it is much higher.
continued at Daily Kos....
