Those affected by wildfire smoke focus on the colors red, purple and maroon on the air quality charts. Red used to be the scariest color. Why did that change?(Story aired on ATC on June 28, 2023.) ...
This week, millions of Americans are anxiously scanning air quality maps focusing on two colors: red and purple. Red indicates "unhealthy" air quality, and purple? "Very unhealthy." When did purple ...
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