The document discusses a new nano-sensor developed by researchers at the University of Pittsburgh that could help people with asthma monitor their condition and detect oncoming asthma attacks. The portable sensor uses carbon nanotubes coated with a polymer to detect small amounts of nitric oxide in exhaled breath. Nitric oxide levels rise before asthma attacks, so the sensor could provide early warnings. It may also allow easier, more regular monitoring of symptoms to help patients and doctors manage treatment. The researchers hope to develop a handheld device incorporating the sensor to make monitoring asthma as convenient as checking blood sugar with a glucose monitor.