Our Terms of Service and Privacy Policy have changed.

By continuing to use this site, you are agreeing to the new Privacy Policy and Terms of Service.

Duluth, Minn.
Duluth, Minn.
Population: 279,771
"Duluth is located at the end of the largest, coldest and cleanest Great Lake," said David Thornton, assistant commissioner of the Minnesota Pollution Control Agency. "It has its own microclimate."

Winds sweep off the lake and clean air drifts in from nearby Canada, helping to dissipate any pollution.

There's also less heavy industry in Duluth, which has helped to clean up the air quality as well. What remains is cleaner too, thanks to state programs that encourage plants to install the latest cleaning systems.

By Les Christie @CNNMoney - Last updated April 26 2012: 11:47 AM ET
Join the Conversation
10 most polluted cities

These 10 cities had the highest levels of year-round pollution, according to the American Lung Association.

Find Homes for sale
  • Property Type
  • Find a home in:
    New York | Atlanta | Chicago | Los Angeles
    Washington D.C | Houston | Philadelphia | More options