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.
The highway is 4,860.2km long ranking as the ninth longest highway in the world and the longest Interstate Highway in the US. The highway runs parallel to the US Route 20 for the most part and passing through 13 states. The I-90's construction commenced in the 1950s.