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.
According to Guinness World Records, the Pan-American Highwaâ¦y is the world's longest motorable road. However, because of the DariÃ©n Gap, it is not possible to cross between South America and Central America by traditional motor vehicle. The Trans Canada highway, it's 7821 km or 4860 miles long.