5 Most Polluted Cities in the U.S.

3. Houston, Texas

Insider Monkey’s Score: 9.25

Houston is part of the Houston-The Woodlands-Sugar Land metropolitan statistical area. It is one of the largest cities in America in terms of population as more than 2.3 million people live within its borders. 2.5 million households were surveyed in the statistical area, out of which a whopping 37% reported signs of cockroaches in the last 12 months, making Houston rank as the number city. However, it ranks quite low in signs of rats or mice. Houston also has a large number of Fortune 500 companies, with most of these in the energy industry.