It’s bad enough to stay shut in your house, terrified, as you ride out a Category 4 hurricane. But the people of Westlake, Louisiana had an additional reason to stay inside last week with the windows clamped tight as Hurricane Laura started a fire at BioLab, unleashing chlorine gas over the small town.

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The hurricane killed at least 14 people, obliterated buildings and tore off roofs as it blustered through southwest Louisiana, home to many of the state’s petrochemical industries. It blew directly over the Hackberry oil field, an area south of Lake Charles that combines active and abandoned oil wells, pipelines and storage tanks with a sensitive marsh ecosystem. It will take some time to figure out the extent of structural and environmental damage. The health consequences may never be known. People who live in this region will only be able to guess in the coming years whether their cancers and other diseases were caused by the chlorine gas or other chemicals, to which they are routinely exposed.

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Chemical leaks are common in Louisiana. Communities around petrochemical companies are accustomed to hearing emergency sirens. Unfortunately, petrochemical companies are often placed in elderly and Black communities. Westlake is less than 5 miles from the decimated town of Mossville, which was started by formerly enslaved peoples in the 1790s. In 2014, the South Africa-based fuel company Sasol bought out most of the residents’ houses to expand its enormous petrochemical plant.

Mossville residents were known for staggeringly high concentrations of dioxins in their blood, as found in 1998 tests conducted by the Agency for Toxic Substances and Disease Registry. This highly toxic substance can impair the immune system, disrupt hormone functions, damage the reproductive system and cause cancer and diabetes. Dioxins can form by heating chlorine to high temperatures, which happened last week when BioLab ignited.

The BioLab facility, which was built in 1979, occupies 15 acres inside a large industrial complex. It manufactures trichloroisocyanuric acid — a bleaching agent and industrial disinfectant — chlorinating granules and other chemical blends for cleaning products. The fire shut down nearby Interstate 10 and required residents to shelter in place for at least 24 hours.

Petrochemical plants often cause problems in hurricanes. Chemical storage tanks are especially problematic. They are built to float, but when the water resettles, the tanks sometimes spring a leak. Floating roofs built to contain vapors often collapse or sink, the wind can buckle tanks and flying debris can puncture a tank’s sides. Because workers are generally evacuated when a storm is on the way, often nobody is there to fix a problem before it has major consequences.

Via The Conversation, CNN and The Intercept

Image via NOAA