50-agent master list of environmental toxicants/contaminants relevant to common or important exposure in the United States and Europe. I am using “common toxins” broadly to include toxic metals, persistent organic pollutants, pesticides, plastic-associated chemicals, combustion products, and VOCs.
A crucial distinction: detecting a chemical or metabolite in blood or urine establishes exposure, not toxicity or causation of symptoms. CDC explicitly cautions against equating biomonitoring detection with disease. European biomonitoring likewise demonstrates widespread exposure to several chemical classes.
50 common or important environmental toxicants
|
# |
Toxicant |
Major everyday/occupational sources |
Major health concern |
|
1 |
Lead (Pb) |
Old paint, contaminated dust/soil, plumbing, occupations |
Neurotoxicity, anemia, renal/CV effects |
|
2 |
Mercury |
Fish, occupational exposure, some products |
Neurologic/developmental toxicity |
|
3 |
Methylmercury |
Large predatory fish/seafood |
Fetal and adult neurotoxicity |
|
4 |
Arsenic |
Groundwater, rice/foods, industrial sources |
Cancer, neuropathy, cardiovascular effects |
|
5 |
Cadmium |
Tobacco smoke, foods, batteries/industry |
Renal, bone and pulmonary toxicity |
|
6 |
Chromium VI |
Welding, plating, pigments, industry |
Respiratory toxicity/carcinogenicity |
|
7 |
Nickel |
Industry, metalwork, contaminated environments |
Dermatitis, respiratory toxicity |
|
8 |
Manganese |
Welding, industry, contaminated water |
Neurotoxicity at excessive exposure |
|
9 |
Bisphenol A (BPA) |
Food-contact materials, epoxy resins |
Endocrine/reproductive concerns |
|
10 |
Bisphenol S (BPS) |
BPA-replacement plastics/paper |
Endocrine concerns |
|
11 |
Bisphenol F (BPF) |
Epoxy resins, food-contact materials |
Endocrine concerns |
|
12 |
DEHP |
PVC/plastic products, medical equipment |
Reproductive/developmental toxicity |
|
13 |
DBP |
Plastics, adhesives, personal products |
Reproductive toxicity |
|
14 |
DiBP |
Plastics, coatings, consumer products |
Reproductive/endocrine effects |
|
15 |
BBP |
Vinyl flooring, PVC, adhesives |
Reproductive/developmental concerns |
|
16 |
DINP |
Flexible PVC and consumer products |
Developmental/reproductive concerns |
|
17 |
PFOA |
Legacy PFAS contamination, consumer/industrial sources |
Immune, metabolic, developmental effects; cancer |
|
18 |
PFOS |
Legacy stain/water-resistant products, firefighting foams |
Immune, developmental/metabolic effects |
|
19 |
PFHxS |
Firefighting foam, industrial/consumer sources |
Persistent PFAS; immune/endocrine concerns |
|
20 |
PFNA |
PFAS manufacturing/environmental contamination |
Developmental, hepatic, immune effects |
|
21 |
PCBs |
Legacy electrical equipment, contaminated sediment/food |
Neurodevelopmental, endocrine, carcinogenic effects |
|
22 |
Dioxins (including TCDD) |
Combustion/incineration; food-chain accumulation |
Cancer, reproductive, immune/endocrine effects |
|
23 |
PBDE flame retardants |
Older furniture, electronics, household dust |
Neurodevelopmental/endocrine effects |
|
24 |
DDT/DDE |
Persistent residues; food/environment |
Endocrine/reproductive effects |
|
25 |
Glyphosate |
Herbicides/agriculture |
Exposure common; health effects remain actively studied |
|
26 |
Atrazine |
Agricultural herbicide; water contamination |
Endocrine/reproductive concerns |
|
27 |
Chlorpyrifos |
Legacy/agricultural insecticide exposure |
Neurodevelopmental toxicity |
|
28 |
Organophosphate pesticides |
Agricultural pesticides, foods, occupational exposure |
Cholinergic/neurodevelopmental toxicity |
|
29 |
Pyrethroids |
Household/agricultural insecticides |
Neurologic effects at sufficient exposure |
|
30 |
2,4-D |
Lawn/agricultural herbicide |
Systemic/neurologic effects at high exposure |
|
31 |
Benzene |
Gasoline, vehicle emissions, tobacco smoke |
Bone-marrow toxicity, leukemia |
|
32 |
Toluene |
Solvents, paints, fuels, adhesives |
CNS/neurotoxicity |
|
33 |
Xylenes |
Paint, solvents, gasoline |
CNS/respiratory effects |
|
34 |
Ethylbenzene |
Fuels, solvents, paints |
Respiratory/CNS effects; cancer concern |
|
35 |
Formaldehyde |
Building materials, furniture, combustion |
Irritation, asthma-related effects, cancer |
|
36 |
Styrene |
Plastics, fiberglass, resins |
Neurologic/respiratory toxicity |
|
37 |
Trichloroethylene (TCE) |
Degreasers, industrial groundwater contamination |
Neurologic, hepatic, renal, cancer risks |
|
38 |
Tetrachloroethylene (PCE) |
Dry cleaning/degreasing, contaminated groundwater |
Neurologic effects/cancer concern |
|
39 |
Methylene chloride |
Paint strippers/solvents |
CNS/cardiotoxicity; cancer |
|
40 |
Vinyl chloride |
PVC production, contaminated groundwater |
Hepatic toxicity/angiosarcoma |
|
41 |
1,4-Dichlorobenzene |
Deodorizers/moth products, industrial sources |
Hepatic/respiratory effects |
|
42 |
Chloroform |
Water-disinfection byproduct, industrial sources |
Hepatic/renal toxicity |
|
43 |
Acrolein |
Tobacco/wood smoke, cooking and combustion |
Potent respiratory irritant |
|
44 |
Carbon monoxide |
Furnaces, engines, fires, generators |
Tissue hypoxia, neurologic/cardiac injury |
|
45 |
Benzo[a]pyrene |
Tobacco smoke, fires, grilled/charred foods, traffic pollution |
Genotoxicity/carcinogenicity |
|
46 |
PAHs |
Combustion, smoke, traffic, charred foods |
Cancer and cardiopulmonary concerns |
|
47 |
Fine particulate matter (PM2.5) |
Traffic, combustion, wildfire, heating |
Cardiovascular/pulmonary morbidity and mortality |
|
48 |
Asbestos |
Older buildings, construction/renovation |
Asbestosis, lung cancer, mesothelioma |
|
49 |
Radon |
Soil/geology → indoor air |
Lung cancer |
|
50 |
Perchlorate |
Contaminated water/food, industrial sources |
Thyroid iodide uptake interference |
Several of the chemicals toward the top of this table also appear prominently on the current ATSDR Substance Priority List. Its 2025 rankings begin with lead, arsenic, cadmium, vinyl chloride, TCE, nickel, benzo[a]pyrene and benzene. Importantly, ATSDR emphasizes that this is not a ranking of the intrinsically “most toxic” chemicals; it incorporates occurrence, toxicity and potential exposure at hazardous-waste sites.
Evidence that exposure is widespread
CDC’s National Exposure Report uses blood and urine from NHANES participants to provide nationally representative estimates of U.S. exposure. Its major categories include metals, PFAS, consumer-product chemicals, pesticides, phthalates, PAHs, tobacco-related chemicals and VOCs.
Europe shows a similar problem. HBM4EU biomonitoring found BPA in 92% of adults sampled across participating European countries, with BPS and BPF detected in 67% and 62%, respectively. European monitoring also identified concerning combined exposure to mixtures of phthalates among children and adolescents.
Full core references
1. Centers for Disease Control and Prevention (CDC). National Report on Human Exposure to Environmental Chemicals. National Center for Environmental Health, Division of Laboratory Sciences. Atlanta, GA: CDC. Updated April 24, 2024. This is one of the most important U.S. sources because it is based on population biomonitoring rather than merely estimates of environmental contamination.
2. Centers for Disease Control and Prevention (CDC). Biomonitoring: Population Exposures. Environmental Public Health Tracking Program. Atlanta, GA: CDC; 2024. The monitored categories include metals/metalloids, PFAS, personal-care and consumer-product metabolites, pesticides, phthalates, PAHs, tobacco smoke, VOCs and disinfection byproducts.
3. Centers for Disease Control and Prevention (CDC). National Exposure Report: Biomonitoring Data Tables for Environmental Chemicals. National Center for Environmental Health. The database contains measurements from blood, serum and urine collected through NHANES.
4. Agency for Toxic Substances and Disease Registry (ATSDR). 2025 Substance Priority List. U.S. Department of Health and Human Services, Atlanta, GA; 2026. The list prioritizes hazardous substances according to frequency at National Priorities List sites, toxicity and potential human exposure.
5. European Environment Agency. Chemicals and Health. In: Zero Pollution Monitoring Assessment. Copenhagen: EEA. This review incorporates European human-biomonitoring findings for bisphenols, phthalates and other important chemical exposures.
6. European Environment Agency. Human Exposure to Bisphenol A in Europe. Copenhagen: EEA. The report summarizes harmonized HBM4EU biomonitoring involving 2,756 adults across 11 European countries and measurements of BPA, BPS and BPF.
An important clinical point
A better approach is to rank them by (1) prevalence of exposure, (2) persistence/bioaccumulation, (3) evidence for human toxicity, (4) neurological effects, (5) endocrine effects, (6) immune/autoimmune associations, (7) carcinogenicity, and (8) availability of clinically validated testing.