Cancer Trends Progress Report

Over the years, many epidemiologic studies have primarily examined specific PFAS compounds such as perfluorooctane acid (PFOA) and perfluorooctane sulfonate (PFOS) due to their early discovery and past industrial usage. While other PFAS compounds exist, we focus on PFOA and PFOS due to the existing assessment within the National Health and Nutritional Examination Survey.

The exposure data presented here is the proportion of homes with an operating radon mitigation system for persons living in homes at risk for radon exposure. This measure is expressed as a percentage. It is calculated for each year by dividing the cumulative number of single family dwellings (SFD) with an operating mitigation system by the number of SFDs estimated to have a radon level ≥4pCi/L, which is EPA’s action level.

We present exposure data on the 95th percentile of the population, representing people with the greatest exposure. The 95th percentile level means that 95% of the population has concentrations below that level. Public health officials use such reference values to determine whether groups of people are experiencing an exposure that is unusual compared with an exposure experienced by the rest of the population.

We present exposure data on the 95th percentile of the population, representing people with the greatest exposure. The 95th percentile level means that 95% of the population has concentrations below that level.

We present exposure data on the 95th percentile of the population, representing people with the greatest exposure. The 95th percentile level means that 95% of the population has concentrations below that level.