The major source of lead exposure for most adults is what?

• A. Occupational exposure
• B. Drinking water
• C. Food contamination
• D. Indoor air

Answer: (A)

Lead exposure in adults mainly comes from work environments where lead is used or produced. In many industries—such as battery manufacturing, metal smelting, construction involving old lead-based paints, or recycling operations—workers can inhale lead dust or fumes or inadvertently ingest it from contaminated hands or surfaces. These occupational exposures can reach levels much higher than what most people encounter from everyday environmental sources, making them the primary source for most adults.

Environmental sources like drinking water, food, and indoor air can contribute to lead exposure, but typically at lower levels for the general adult population. Modern regulations have reduced lead in many environmental pathways, and workplace controls are specifically aimed at keeping occupational exposures low. So when assessing risk or planning protections for adults, focusing on reducing and monitoring workplace lead exposure is most impactful.