Benzene at oil refineries and cancer risk

This page is for refinery workers, past and present, and the people close to them. It looks at what NCI says about benzene, where most exposure really comes from, and what steps make sense.

Benzene is not something a company chose to add to petroleum. The National Cancer Institute says it occurs naturally in crude oil. It is used in making gasoline. It is also a widely used industrial solvent.

Because benzene is in crude oil and used in gasoline production, refinery work can bring people near it. NCI points to CDC for how to protect yourself at work.

The core statement is short. Exposure to benzene raises the risk of leukemia and other blood disorders.

Leukemia is cancer of the blood-forming tissue. That includes the bone marrow, where blood cells are made. That is why the harm NCI describes shows up in the blood.

NCI describes exposure through several routes:

• industrial workers in manufacturing and chemical plants
• gasoline fumes and motor vehicle exhaust
• glues, adhesives, cleaning products, and paint strippers
• natural sources, including volcanic activity and forest fires

NCI says industrial workers face the highest occupational levels of benzene.

Here is the number that changes how this topic looks. NCI reports that mainstream cigarette smoke accounts for about half of total benzene exposure in the U.S. population. And among people who smoke, 90 percent of their benzene exposure comes from smoking.

NCI's figures are about the whole U.S. population and about people who smoke. They do not measure any one workplace. They are not a reason to relax about exposure at work. They do show that for someone who smokes, smoking is the largest benzene source NCI describes, so quitting matters.

NCI's advice is practical. Avoid smoking and secondhand tobacco smoke. Limit contact with gasoline fumes. For protection at work, NCI points to CDC resources. That is the right place for job-specific detail.

For job-specific protection, see the CDC information NCI links to. Your employer or occupational health service can explain the controls used at your site.

Ask your employer or occupational health service whether exposure monitoring results are available for your work area. This advice is not from NCI.

Get your job history into your medical record. Note the years, the sites, and the roles. A doctor treating you in twenty years will not know unless it is written down.

Take the smoking question seriously, however tired you are of hearing it. Given NCI's figures above, smoking is a major source of benzene for people who smoke.

Report unexplained bruising. Report unusual tiredness, repeated infections, or bleeding that seems out of proportion. These have many ordinary causes, and they rarely turn out to be serious. But they are worth mentioning rather than sitting on. That is especially true with this exposure history behind you.

Families of refinery workers sometimes ask whether anything gets carried home. This page cannot answer that for one plant. The honest response is to point at the people who can. That means the site occupational health service, and the union or safety representative. Both will know the specific processes involved.

Try to avoid the two extremes. Do not brush the question aside. And do not treat every shift as a hazard. Neither view matches how exposure really works in a controlled industrial setting.