Studies reveal the hidden dangers behind outdoor secondhand smoke exposure. A 2006 U.S. Surgeon General's Report claims secondhand smoke kills tens of thousands of people each year, and it has long been claimed that second hand smoke can be dangerous through indoor exposure. However little is known about the risks of outdoor inhalation. Recent research from Stanford University examines how smoking can affect the quality of air at park benches, sidewalk cafes and other public places. Researchers concluded that sitting a few feet downwind of a smoker can leave someone exposed to contaminated fumes that are much more concentrated than normal air pollution levels. To accurately quantify the level of outdoor smoke exposure, Stanford Researchers used portable electronic monitors to measure toxic airborne particles. These instruments are designed to detect a hazardous chemical known as particulate matter-2.5 (PM2.5). This toxic pollutant contains carcinogens amongst other chemicals that...