 What we looked at was the cities that have the most pollution, the dirtiest cities. San Bernardino, California is number one. Detroit is number two. Reading, Pennsylvania, three. Newark, New Jersey, Ontario, California. These are the top five. Phoenix, Arizona, six. These are all cities that have a lot of polluted air. They also have water quality issues, and they also just have cleanliness issues. So if you have a dog in any of these cities,