Hundreds of workers in the Gulf Coast cleaning up BP’s oil disaster have reported symptoms of nausea, vomiting, nose bleeds, and headaches, but those “almost all have been heat related,” according to Deputy Assistant Secretary of Labor for OSHA Jordan Barab.

Barab – a former worker health and safety blogger at Firedoglake and his blog, Confined Space – says that despite widespread assumptions that workers are sick from exposure to oil, “we haven’t really found that yet.”