Venice , Louisiana ( CNN ) -- Seven oil spill recovery workers who were hospitalized in New Orleans after complaining of feeling ill were properly trained and had protective gear on , according to the the federal on-scene coordinator for the oil spill response effort in the Gulf of Mexico . `` The heat and humidity in Louisiana can be challenging , '' Coast Guard Rear Adm. Mary Landry told reporters Thursday afternoon . She said the workers were treated for several symptoms , including headaches , nausea , vomiting and shortness of breath . Safety officials from the Coast Guard , BP and the federal Occupational Safety and Health Administration had responded to the incident , Landry . `` Basically , these folks all had the proper personal protective equipment on , and they all received the required training , '' she said . `` Fortunately , everyone is fine . '' An investigation is under way `` to make sure what we can do to ensure that these workers are all working in safe conditions , '' Landry said . `` We will continue to monitor this situation very carefully so that nobody is put in harm 's way as they respond to this spill , '' she added . A BP spokesman , John Curry , said the company takes `` worker safety seriously . '' The company also said it has provided spill recovery workers with protective equipment , such as suits , steel-toed boots , gloves , hard hats and safety glasses . In addition , BP said , workers are conducting about 250 air-quality tests a day . They also are testing workers for exposure to irritants and other substances that could be harmful , BP said . The company also noted that testing has shown that `` airborne contaminants are well within safe limits . '' The seven workers were at West Jefferson Medical Center in suburban New Orleans , said spokeswoman Taslin Alfonzo said . Five were discharged Thursday afternoon , she said . Based on their symptoms , the workers appeared to have come into contact with some type of irritant , Alfonzo said . However , the hospital does n't have a toxicology department , so it could n't identify the irritant . About 10 workers complained of feeling ill on Wednesday , prompting officials to recall more than 100 boats from an area adjacent to the Mississippi River delta . Lisa Faust with the Louisiana Department of Health and Hospitals said she believes as many as five were treated at the scene . Six of the seven were brought to the Marrero , Louisiana , hospital Wednesday night by ambulance , and the seventh was flown in . No additional patients have been admitted , Alfonzo said . The Unified Command -- a coalition of agencies including the U.S. Coast Guard , the Department of the Interior and the National Parks Service -- said Wednesday it recalled 125 vessels from Breton Sound , which lies about 50 miles southeast of New Orleans . The vessels were involved in cleaning up oil that has been gushing into the Gulf of Mexico since April , when an oil rig sank about 40 miles south of Louisiana , opening up a leak that has been gushing crude oil into the water . U.S. Rep. Charlie Melancon , D-Louisiana , again called on the federal government to deploy temporary clinics to south Louisiana to screen workers and relatives possibly affected by the oil . `` As I first alerted the federal government over a week ago , our workers and residents in the oil-affected areas of south Louisiana are facing a looming health crisis , '' Melancon said in a written statement . `` People are being exposed to hazardous oil fumes and potentially dangerous dispersants every day , and there is no health care infrastructure in place to treat them and monitor the situation . '' Melancon said he will personally ask President Barack Obama to take action when Obama visits south Louisiana on Friday .
NEW : BP says it takes worker safety seriously . NEW : BP says it conducts safety tests and provides safety gear . 125 commercial vessels recalled from water near Louisiana . Congressman urges government to set up mobile clinics .