A new report reveals the 10 cities where Americans are most likely to have the best skin.
Researchers analyzed data from hundreds of cities across the country for their rankings.
They ranked cities based on eight factors, including air pollution, UV levels and work hours, which can indicate stress.
Overall, cities in the west of the country performed best in the index: only two of the top 10 were in the east and none in the south.
The map above shows the ten cities where researchers said people would have the best skin in the US.
Above is an image of Cheyenne, Wyoming, where people have the best quality of skin, according to the report.
Cheyenne, Wyoming, one of the highest capital cities in the U.S. at 6,000 feet, took the top spot, due to its clean air, short workday and few traffic jams.
Billings, Montana came in second, due to its moderate UV levels, while Denver, Colorado came in third, also due to its low UV levels.
Rounding out the top five were Albuquerque, New Mexico, and Salt Lake City, Utah.
Experts at Liberty London, a fashion retail chain that conducted the research, used statistics from the US Bureau of Labor Statistics, satellite navigation companies and online forecasting websites for the analysis.
Other factors they looked at included temperature, humidity, smoking rates and the number of hours of sunlight per day in an area.
The skin is firm and elastic in young people because it contains a large amount of collagen and elastin fibers.
But from the age of 25, experts say, it can start to lose this quality, as the body begins to produce less of these fibers.
Fine lines may begin to appear and people may also begin to lose volume in their face as the skin ages.
This process can be accelerated by regular exposure to sunlight, which has UV rays that damage collagen and elastin fibers, causing them to lose their elasticity.
Air pollution can also cause skin to age faster because it releases free radicals (or unstable atoms) into the air that damage skin cells.
Even stress can cause this, as it can cause inflammation in the body that impairs the ability of cells to repair damage, including those in the skin.
To protect your skin, experts recommend using sunscreen daily, staying hydrated and moisturizing your skin every night.
Other recommendations included avoiding smoking, eating a balanced diet and controlling stress levels.