What it Can Tell Us
Exposure data can tell us about the levels of measured chemicals or other agents in people (such as blood lead levels).
What it Cannot Tell Us
These data cannot tell us how a person was exposed to the chemical. The measurement of a chemical in a person's blood or urine also does not by itself mean that the chemical causes disease. Advances in analytical methods allow us to measure lower and lower levels of environmental chemicals in people. Separate studies of varying exposure levels and health effects are required to determine which blood and urine levels are safe and which result in disease.
We identify the type and/or source of data, timeframe, geographic coverage and presentation (tables, maps or reports). Some additional comments are also provided.