CTEH is the company contracted by BP to monitor air levels as they related to recovery worker safety in the Gulf of Mexico. The firm, which has a sordid history of covering up corporate environmental disasters, just released new data with BP yesterday that shows disturbing levels of toxic dispersants in 20% of offshore recovery workers and 15% of near-shore workers. But these just aren’t any toxic dispersants. It’s the same chemical blamed for chronic health problems in Exxon Valdez recovery workers that is now poisoning at least one-fifth of BP’s offshore recovery workers.