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Crater Lake National Park in Oregon has some of the cleanest air in the United States, and the hiking trails are great for all experience levels.

United statesCrater lake national parkBykatie downeyNational park serviceOregon department of environmental qualityStriking national park has americaCleanest air and such scenic hikingLake national parkClean air actCrater lakeWorld populationNational parkCrater lake nationalCascade mountainsFire lookoutMount scott