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.
I-95 is the longest northâsouth Interstate, followed by I-75, and the sixth-longest Interstate Highway overall after I-70 (2,153 miles, 3,465 km), I-10 (2,460 miles, 3,959 km), I-40 (2,555 miles, 4,112 km), I-80 (2,899 miles, 4,665 km), and I-90 (3,099 miles, 4,987 km).