Cancer-causing chemicals; Environmental carcinogens; Chemical exposure; Pesticide risks; Atrazine; Chloroform; Diesel exhaust; DEHP; Formaldehyde; Lead compounds; PCBs; Styrene; Perchloroethylene; Titanium dioxide nanoparticles; Occupational chemical haza

20 cancer-causing chemicals we are inadvertently exposed to every day

Previously, the American Cancer Society (ACS), U.S. government agencies, and the International Agency for Research on Cancer (IARC) released a list of 20 chemicals linked to cancer that are still widely used in daily life. More recently, the U.S. President’s Cancer Panel reported that environmental chemicals are one of the contributing factors to cancer in the United States. However, the ACS argued that the report overstated the role of environmental exposures while overlooking stronger risk factors, such as tobacco smoke and obesity.

A List of Widely Used Chemicals That May Cause Cancer

After reviewing available evidence, the research team selected 20 chemicals known to cause cancer in animals and then evaluated their potential carcinogenicity in humans. Most of these substances are industrial chemicals, such as carbon black—used in synthetic rubber manufacturing and welding. Other chemicals are more commonly encountered, including those found in sunscreen or drinking water.

Notable examples include:

• Atrazine: A pesticide banned in Switzerland.

• Chloroform: A by-product of municipal water disinfection.

• Diesel engine exhaust.

• Diethylhexyl phthalate (DEHP): A chemical used to soften vinyl plastics.

• Formaldehyde: A confirmed human carcinogen known to cause throat irritation, nasal cancer, and suspected to be linked to leukemia. It is widely used in building materials.

• Lead and lead compounds.

• Polychlorinated biphenyls (PCBs): Industrial chemicals banned since the 1980s.

• Styrene: Used to make polystyrene found in foam packaging and plastic containers.

• Perchloroethylene: A common dry-cleaning solvent.

• Titanium dioxide: A pigment and sunscreen ingredient; nanoscale particles are suspected of causing brain damage.

How to Reduce Exposure to Potentially Carcinogenic Chemicals

1. Use a water filtration system

High-quality water filters can remove contaminants such as atrazine, chloroform, and other industrial chemicals associated with increased cancer risk.

2. Choose organic foods

Switching to organic produce lowers exposure to harmful pesticides like atrazine while providing greater nutritional benefits and supporting environmental protection.

3. Limit consumption of take-away coffee and food

Foam containers and disposable cups made of polystyrene can release styrene—a chemical linked to cancer risk. Using your own glass or stainless-steel containers is recommended.

4. Be cautious with products containing triclosan

A study published in the Proceedings of the National Academy of Sciences (PNAS) found that triclosan caused liver fibrosis and cancer in laboratory mice. This chemical is commonly found in soaps, mouthwash, and toothpaste.

5. Reduce use of vinyl plastic products

Phthalates in vinyl plastics can disrupt hormones, contribute to early puberty, and increase breast cancer risk. Glass, stainless steel, or wood alternatives are safer options.

6. Limit dry-cleaning services

Many dry-cleaned garments contain residues of perchloroethylene, a chemical associated with headaches, asthma, and possible long-term health effects.

7. Review sunscreen ingredients carefully

Although sunscreen is essential for preventing skin cancer, nanosized titanium dioxide particles may penetrate the skin, enter the bloodstream, and potentially damage the brain, colon, or other organs.