Sunlight & UV

For Public Health

At a glance

Tracking sunlight and UV exposures in a standard way can help us identify regions of the country with high exposure and assess trends over time.
Family of five hiking with dog with sun shining brightly

We Track That

The Tracking Network includes data on exposure to sunlight and UV in the United States. These data come from Emory University's Environmental Remote Sensing Group at the Rollins School of Public Health. Additional data sources include LegiScan and the American Society for Dermatologic Surgery Association.

Types of Data

Sunlight Exposure

This indicator provides state and county level data on monthly and annual average exposure to sunlight.

UV Radiation Exposure

This indicator provides state and county level data on monthly and annual average doses of UV irradiance. These are measured daily and at noon.

Sunlight/UV Vulnerability and Preparedness

This indicator provides state-level data on laws related to UV exposure among minors. The laws regard sunscreen use in schools and indoor tanning restrictions for individuals younger than 18 years.

Access the Data

Use the Data Explorer to create custom maps, tables, and charts.

View data in simple Quick Reports.

Get machine-readable data through the Application Program Interface (API).

Data in Action

The Tracking Network's sunlight and UV exposure data can be used for several actions.

  • Understanding how solar radiation levels are changing across geography and time
  • Identifying areas where intensity may be increasing
  • Informing planning and implementation of programs and services for people living in regions of high exposure
  • Identifying states with laws or policies that help reduce exposure to sunlight and UV, particularly among minors

Monitoring, collecting, and disseminating sunlight and UV exposure information supports development of policies and educational resources. This is an important first step to preventing the harmful effects related to excessive exposures.

Content Source
National Center for Environmental Health
About This Page
Published: May 15, 2024
Updated: November 20, 2023

This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.

Reviewed: August 26, 2026

The information on this page was last reviewed by subject matter experts to ensure accuracy.