A few days ago, in the United Kingdom, the sky was red, yellow, and orange. Citizens could see a yellow haze hanging over the city and the sun had turned bright red. The clouds held an orange glow and some even reported smelling sulfur heavy in the air. Many areas were forced to turn on the street lights in the middle of the day due to the lack of vision.
These events have been attributed to Hurricane Ophelia rolling in, bringing in dust and tropical air from the Sarahan Desert, carried by string winds from Africa. Met Office forecaster explained it as, "the eastern side of the low pressure system air coming up in the southern direction...air is being pulled from southern Europe and Africa and that air contains a lot of dust." This dust was dragged high up into the atmosphere where the light from the sun was scattered in longer wavelengths, which is the red part of the spectrum, which is why the sun appeared red to many people's eyes.
Those with asthma were advised to stay indoors to avoid any health problems.
http://metro.co.uk/2017/10/17/why-was-the-sun-red-how-ophelia-caused-the-weird-weather-phenomenon-7005621/
http://www.telegraph.co.uk/news/2017/10/16/strange-red-sun-phenomenon-seen-across-england-caused-hurricane/
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