Portable and precise gas sensor could monitor pollution and detect disease

Portable and precise gas sensor could monitor pollution and detect disease   
http://www.eurekalert.org/pub_releases/2009-09/pues-pap091809.php 
 
"In the air, it is a serious pollutant. In the body, it plays a role in heart rate, blood flow, nerve signals and immune function.  Nitric oxide, a gas well known to scientists for its myriad functions, has proven challenging to measure accurately outside the laboratory. A team of Princeton and Rice University researchers has demonstrated a new method of identifying the gas using lasers and sensors that are inexpensive, compact and highly sensitive. Such a portable device, suitable for large-scale deployment, could be of great value to atmospheric science, pollution control, biology and medicine."