Residents in Indiana, California, Washington, Oregon and even Hawaii have noticed the sun appearing orange-red, and experts say the color is due to smoke particles high in the sky that have blown ...

Everyone knows that red means danger, but how did purple become a cautionary color? At an EPA conference in the late 1990s, attendees nearly came to blows over color coding on the Air Quality Index.

Wildfire smoke from Canada helped give the sun and moon a red-orange tint overnight into Tuesday, Mike Bettes, a Weather Channel meteorologist, told CBS News, noting that they appeared red in ...

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?

According to the National Forest Service, the red smoke is a mix of fire retardant chemicals used to safely contain wildfire flames. The exact chemical makeup of the fire retardant varies, but the ...

It also forms a red-colored smoke cloud more effectively than current dyes, the researchers say. Commercialized in 1986, diketopyrrolopyrrole (DPP) dyes are used as colorants in car paints ...

During the summer when wildfire smoke takes over the skies, you’ll often notice the dreary haze during the day. But at night, the sun seems to display extra vibrant colors, making for ...

The smoke particles from the fires allow sunlight's longer wavelength colors like red and orange to get through while blocking the shorter wavelengths of yellow, blue and green.

PICATINNY ARSENAL, N.J. (Army News Service, May 3, 2007) - Soldiers on the battlefield use colored smoke in a ... But scientists have found changes to the red and violet M18 smoke grenades to be ...