Everyone should go check out the AQI site and see what the index is in their area. It's really fascinating to study the stuff we breathe in on a daily basis without even realizing it, and understanding the related health effects of various toxins and pollutants.
The AQI info site can be found here: http://airnow.gov/index.cfm?action=static.aqi
An interactive map can be located here: http://airnow.gov/index.cfm?action=airnow.national
Obviously big cities tend to have a little more air pollution, but I was really surprised to see how many "Moderate" ratings Florida received as opposed to Texas which rated almost entirely "Good".
