Virginia EPHT program provides a “Data Embedded Visualization” (a mirror image) of air quality data available from CDC's Environmental Public Health Tracking Network. Displayed below are the number of days, based on monitor data, over the daily maximum ozone National Ambient Air Quality Standard (NAAQS) concentration of 0.070 ppm.

To view information about the calculations, uses, sources, and more, please click the green About Data button in the upper right corner of the map. To download the map data, please use the download button next to the About Data button.