How purple came to be a scarier color than red on the Air Quality Index

Millions of Americas affected by wildfire smoke are focusing on the colors red, purple and maroon on the Air Quality Index charts. Red used to be the scariest color. Why did that change?

Millions of Americas affected by wildfire smoke are focusing on the colors red, purple and maroon on the Air Quality Index charts. Red used to be the scariest color. Why did that change?

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