With Earth Day coming up, find out which 25 cities are considered the "greenest" in America.
Finance site Nerdwallet.com ranked the country's 95 largest cities on their environmental friendliness using a formula that accounts for the median Air Quality Index, number of parks per 10,000 residents, the percentage of commuters not using cars and wasted fuel as a result of traffic congestion. Here are the resulting 25 greenest cities in America:
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