Tagged With Lung

Pulse oximeter: What it measures, how it works, and how to read it


Here's what's inside a whale's blowhole -- and it's not seawater


An undercover investigation reveals air quality on a cruise ship deck could be worse than the world's most polluted cities



How U.S. cities would look without the Clean Air Act


The way most people breathe is hurting their health -- here's the right way to do it