If you’re not sure, you can easily visit a few Web sites and find out (see sidebar). Environmental mapping on the Internet is evolving rapidly as a way for realtors, home buyers and home sellers to find pollution hotspots.

Mapping features on the Web communicate better than text or graphics such as charts. Some environmental maps already use aerial images photographed from aircraft and satellites with high-resolution cameras (see http://globeexplorer.com). 3-D and in-ground mapping programs for environmental pollution are also available on the Web.