Lead-based paint is a major source of lead poisoning, particularly in older homes and buildings.

Coal-fired power plants are the largest source of mercury pollution in the United States, releasing significant amounts of mercury into the air.

DDT is a persistent organic pollutant (POP) that was widely used as a pesticide in the past, but its use is now restricted due to its harmful effects on the environment and human health.

Asbestos exposure primarily occurs during construction and renovation activities involving materials containing asbestos, such as insulation, roofing, and flooring.

Benzene is a known human carcinogen, and exposure to high levels of benzene can increase the risk of developing leukemia and other blood cancers.

Incineration of waste, particularly hazardous waste, is a major source of dioxin pollution, releasing significant amounts of dioxins into the air.

Polybrominated diphenyl ethers (PBDEs) are a group of chemicals commonly used as flame retardants in a variety of products, including electronics, furniture, and textiles.

Industrial emissions, particularly from electrical equipment manufacturing and waste incineration, are the primary source of polychlorinated biphenyls (PCBs) in the environment.

Trichloroethylene (TCE) is a chlorinated hydrocarbon commonly used as a solvent in various industrial and commercial applications.

Refrigeration and air conditioning systems are the primary source of chlorofluorocarbons (CFCs) in the environment, releasing significant amounts of CFCs into the atmosphere.

Lead is a known neurotoxin, and exposure to high levels of lead can cause a range of neurological problems, including cognitive impairment, behavioral changes, and developmental delays.

Agricultural runoff is the primary source of pesticides in the environment, as pesticides applied to crops can be carried by rainwater into waterways and soil.

Phthalates are a group of chemicals commonly used as plasticizers in a variety of products, including plastics, vinyl, and personal care products.

Mining activities are the primary source of heavy metal pollution in the environment, as mining operations can release significant amounts of heavy metals into the air, water, and soil.

Bisphenol A (BPA) is a known endocrine disruptor, and exposure to BPA can interfere with the normal functioning of the endocrine system, leading to a range of health problems.