. >> reporter: 11-year-old john fitzpatrick has dreams of being a professional basketball player. or maybe a pop star. there is one thing holding him back. john has severe asthma. >> when i run, it gets me out of breath fast. >> reporter: and he's not alone. 27% of children and 37% of adults have asthma. children here are seven times more likely to be hospitalized for asthma than in the rest of the state. >> i wish we could live in a better area where there's not as much traffic continuously up and down the streets all day. you can't even really walk out of our door to school without coughing or perhaps throwing up on the way. >> reporter: 10,000 trucks pass through oakland each day, not to mention the emissions from 880, 980, 580 and the shift coming in and out of the port. >> we're in the good part of town where it's safe or more safer for him to live, where the air quality is much better. >> it takes air every second that we walk. >> reporter: they're testing a package on your cell phone. >> someday you may be able to test air quality indoor or outdoor. before you make a run, be