Look around and you will see pollution everywhere. Gone are the days when we would live in big houses, with trees all around. To accommodate the rising population, jungles are being cleared. As trees are being axed, more and more species of animals are becoming extinct. It is very rare to hear a cuckoo sing in the morning these days. The sound of the woodpecker is not commonplace today. Who has brought all these negative changes? Man has always played with nature for his selfish motives. Automobiles emit toxic gas like carbon monoxide and nitrogen dioxide into the atmosphere. Due to the depletion of the Ozone layer, the harmful rays of the sun reach into the earth’s cover, and cause cancer and other skin ailments in human beings, and animals. Glaciers, according to environmental scientists, are melting at a rapid rate. As a result, the sea level is increasing. Scientists warn that if this destruction continues, sooner or later life on earth will come to an end. Are you looking to move to a healthier city? Which are the top 10 healthiest cities in the United States of America? San Jose, California, is home to the healthiest city dwellers. Oakland, Sacramento and San Francisco are some of the cleanest cities in California, and the United States. When it comes to overall mental and emotional health, Washington, DC wins hands down. It comes as no surprise that people of this city have low average body mass index (BMI). Austin-San Marcos (Texas), Oakland (California), Denver (Colorado) and Orange County (California) are some of the healthiest cities in the United States in terms of physical heath, BMI, and emotional well being. Philadelphia is yet another destination for the health freaks. Philadelphia Apartments are home to hundreds of men and women of different age-groups who have low BMI, and excellent physical health.