Benzene leaks from underground storage tanks or from hazardous waste sites containing benzene can contaminate well water. The air around hazardous waste sites or gas stations can contain higher levels of benzene than in other areas. The benzene in indoor air comes from products that contain benzene such as glues, paints, furniture wax, and detergents. Indoor air generally contains levels of benzene higher than those in outdoor air. Outdoor air contains low levels of benzene from tobacco smoke, gas stations, motor vehicle exhaust, and industrial emissions. Benzene is also used to make some types of lubricants, rubbers, dyes, detergents, drugs, and pesticides. Some industries use benzene to make other chemicals that are used to make plastics, resins, and nylon and synthetic fibers. It ranks in the top 20 chemicals for production volume. Benzene is widely used in the United States. 
Benzene is also a natural part of crude oil, gasoline, and cigarette smoke. Natural sources of benzene include volcanoes and forest fires.Benzene is formed from both natural processes and human activities.Where benzene is found and how it is used Benzene dissolves only slightly in water and will float on top of water.
Its vapor is heavier than air and may sink into low-lying areas. Benzene evaporates into the air very quickly.It has a sweet odor and is highly flammable. Benzene is a chemical that is a colorless or light yellow liquid at room temperature.
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