http://www.southernstudies.org/2010/05/air-tests-from-the-louisiana-coast-reveal-human-health-threats-from-the-oil-disaster.htmlFor instance, hydrogen sulfide has been detected at concentrations more than 100 times greater than the level known to cause physical reactions in people. Among the health effects of hydrogen sulfide exposure are eye and respiratory irritation as well as nausea, dizziness, confusion and headache.
The concentration threshold for people to experience physical symptoms from hydrogen sulfide is about 5 to 10 parts per billion. But as recently as last Thursday, the EPA measured levels at 1,000 ppb. The highest levels of airborne hydrogen sulfide measured so far were on May 3, at 1,192 ppb.
Testing data also shows levels of volatile organic chemicals that far exceed Louisiana's own ambient air standards. VOCs cause acute physical health symptoms including eye, skin and respiratory irritation as well as headaches, dizziness, weakness, nausea and confusion.
Louisiana's ambient air standard for the VOC benzene, for example, is 3.76 ppb, while its standard for methylene chloride is 61.25 ppb. Long-term exposure to airborne benzene has been linked to cancer, while the EPA considers methylene chloride a probable carcinogen.