Overlays on top of user-supplied graphic file (JPG, BMP).

Each site location is defined by pixel location within the map file. At site location, a box is shown with the most recent AQI value (number) and color coded per EPA AQI codes. Mouse roll-over would provide responsible parameter and concentration.

Clicking on the site leads to the Site Report/Page.

A selector box allows the latst AQI, along with description and short health warning to be shown for a selected user-defined "region" or for the whole network. This report appears as a 'floating div' atop the page that can be X-cancelled.

A status bar at the bottom of the page shows "last updated on <date> <time>"

If AQI value is missing in database, box shows "???" and is colored grey.

A legend of AQI colors (clickable, leads to user-defined URL destination) is provided at the bottom right.