Sagot :
Answer:Long-term exposure to high levels of benzene in the air can cause leukemia
Explanation:What benzene is
Benzene is a chemical that is a colorless or light yellow liquid at room temperature. It has a sweet odor and is highly flammable.
Benzene evaporates into the air very quickly. Its vapor is heavier than air and may sink into low-lying areas.
Benzene dissolves only slightly in water and will float on top of water.
Where benzene is found and how it is used
Benzene is formed from both natural processes and human activities.
Natural sources of benzene include volcanoes and forest fires. Benzene is also a natural part of crude oil, gasoline, and cigarette smoke.
Benzene is widely used in the United States. It ranks in the top 20 chemicals for production volume.
Some industries use benzene to make other chemicals that are used to make plastics, resins, and nylon and synthetic fibers. Benzene is also used to make some types of lubricants, rubbers, dyes, detergents, drugs, and pesticides.
How you could be exposed to benzene
Outdoor air contains low levels of benzene from tobacco smoke, gas stations, motor vehicle exhaust, and industrial emissions.
Indoor air generally contains levels of benzene higher than those in outdoor air. The benzene in indoor air comes from products that contain benzene such as glues, paints, furniture wax, and detergents.
The air around hazardous waste sites or gas stations can contain higher levels of benzene than in other areas.
Benzene leaks from underground storage tanks or from hazardous waste sites containing benzene can contaminate well water.
People working in industries that make or use benzene may be exposed to the highest levels of it.
A major source of benzene exposure is tobacco smoke.
How benzene works
Benzene works by causing cells not to work correctly. For example, it can cause bone marrow not to produce enough red blood cells, which can lead to anemia. Also, it can damage the immune system by changing blood levels of antibodies and causing the loss of white blood cells.
The seriousness of poisoning caused by benzene depends on the amount, route, and length of time of exposure, as well as the age and preexisting medical condition of the exposed person.