CDC data: Cumulative amount of Hydrogen Sulfide INCREASES 700 PERCENT in coastal Louisiana since well was ‘capped’ on July 15


CDC data: Cumulative amount of Hydrogen Sulfide INCREASES 700 PERCENT in coastal Louisiana since well was ‘capped’ on July 15

Hourly readings in last day have averaged 15-20 times above the EPA’s “safe exposure level”

Human Health Effects from Exposure to Low-Level Concentrations of Hydrogen Sulfide, Occupational Health & Safety, October 2007:

EPA set the safe exposure level at 0.00014 ppm. [.14 ppb]

Yet EPA air monitoring has constantly shown much higher levels of H2S since July and reached an astonishing 9 PPB on July 30th which is over 64 times the exposure level.

The cumulative average of amount of exposure since is currently at 0.8 PPB 7/13/2010 which means that residents have on average been subjected to almost 6 times the exposure limit over the last month.

From the CDC: The EPA is monitoring air quality in the Gulf Coast region. The maps and charts are available here.

To investigate some readings obtained with portable hydrogen sulfide (H2S) monitors near Venice, Louisiana, EPA has deployed a high-resolution self-contained laboratory to conduct real-time monitoring of H2S in outdoor air. Data from that laboratory are presented on this page




On Hydrogen Sulfide OSHA writes:

Health effects of H2S exposure

Hydrogen sulfide is both an irritant and a chemical asphyxiant with effects on both oxygen utilization and the central nervous system. Its health effects can vary depending on the level and duration of exposure. Repeated exposure can result in health effects occurring at levels that were previously tolerated without any effect.

Low concentrations irritate the eyes, nose, throat and respiratory system (e.g., burning/ tearing of eyes, cough, shortness of breath). Asthmatics may experience breathing difficulties. The effects can be delayed for several hours, or sometimes several days, when working in low-level concentrations.
Repeated or prolonged exposures may cause eye inflammation, headache, fatigue, irritability, insomnia, digestive disturbances and weight loss.
Moderate concentrations can cause more severe eye and respiratory irritation (including coughing, difficulty breathing, accumulation of fluid in the lungs), headache, dizziness, nausea, vomiting, staggering and excitability.

High concentrations can cause shock, convulsions, inability to breathe, extremely rapid unconsciousness, coma and death. Effects can occur within a few breaths, and possibly a single breath.


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