Environment National How purple came to be a scarier color than red on the Air Quality Index 4:28pm June 28, 2023 by Neda Ulaby Climate Share URL copied to clipboard! Copyright 2023 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered Arts Retired federal judge recounts the 'Grand Bargain' that saved Detroit by Tinbete Ermyas Arts Michelle Buteau talks about finding her place the stand-up comedy world 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate