Which of the following is a known neurotoxin found indoors?

Lead is a well-documented neurotoxin that can be found in indoor environments, particularly in older buildings where lead-based paints or plumbing may still exist. When lead dust is generated from peeling paint or renovations, it can become airborne or settle on surfaces, posing a health risk, especially to young children and pregnant women. Lead exposure is associated with a range of serious health issues, including developmental delays, learning disabilities, and other cognitive impairments. This makes it critical to identify and mitigate lead exposure in indoor settings.

Radon is a naturally occurring radioactive gas that can accumulate indoors but primarily poses a risk of lung cancer rather than neurotoxic effects. Asbestos is primarily associated with respiratory issues and certain cancers but is not classified as a neurotoxin. Particulates can have various health effects, particularly respiratory and cardiovascular concerns, but are not specifically classified as neurotoxins. Thus, lead is the clear choice when identifying a known neurotoxin prevalent indoors.