Floodlights at the Providence Park show the fog around the ground
Players took breaks every 15 minutes and oxygen tanks were made available because of poor air quality during a National Women's Soccer League match.
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Portland Thorns played Sky Blues FC after days of hazy skies caused by wildfire smoke in Oregon.
Although air quality tests taken six hours before kick-off measured outside the healthy range, the game went ahead.
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A crowd of 17,986 saw Portland qualify for the play offs with a 2-1 victory at Providence Park.
Source: bbc.com