With two of my three kids diagnosed with asthma--the only one not is the gymnast who spends most of her exercise time indoors--I started wondering where I could go to breath clean air. Here's Money Magazine's list of the top 25 cities ranked by percentage of 'good' air quality days. The lowest on the list of top 25 has good air days 95.3% of the time. We here in the greater Columbus, OH area have good air 33.7% of the time. Damned coal power.