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.
Except for a rainforest break of approximately 100 km (60 mi), called the Darien DariÃ©n, gap the road links almost all of the mainland nations of The americas in a connected highway. System according To Guinness World, records The-Pan American highway is the'world s longest motorable. road