Overview. If you frequently experience shortness of breath or you hear a whistling or wheezy sound in your chest when you breathe, you may have asthma â a chronic condition that causes inflammation and narrowing of the bronchial tubes, the passageways that allow air to enter and leave the lungs.
1 At 47,958 kilometres (29,800 miles) in total length, the Pan-American Highway is the longest road in the world.  The road starts in Alaska, North America and ends in the lower reaches of South America.
kgb answers Â» Records & Statistics Â» What are the top 5 longest highways in the united states? According to the Federal Highway Administration, the longest road in the United States was once the second longest: U.S. 20 from Boston, Massachusetts, to Newport, Oregon.