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.
Length of highway: 29,825 miles (48,000 kilometers) Topping the list of 10 longest highways in the world by several country miles (pun intended), the length of this highway can be judged from the fact that it passes through different climates and areas, from jungles to deserts.